Chapter 11. Known issues

The auth and authconfig Kickstart commands require the AppStream repository

The authselect-compat package is required by the auth and authconfig Kickstart commands during installation. Without this package, the installation fails if auth or authconfig are used. However, by design, the authselect-compat package is only available in the AppStream repository.

The reboot --kexec and inst.kexec commands do not provide a predictable system state

Performing a RHEL installation with the reboot --kexec Kickstart command or the inst.kexec kernel boot parameters do not provide the same predictable system state as a full reboot. As a consequence, switching to the installed system without rebooting can produce unpredictable results.

Unexpected SELinux policies on systems where Anaconda is running as an application

When Anaconda is running as an application on an already installed system (for example to perform another installation to an image file using the –image anaconda option), the system is not prohibited to modify the SELinux types and attributes during installation. As a consequence, certain elements of SELinux policy might change on the system where Anaconda is running.

Local Media installation source is not detected when booting the installation from a USB that is created using a third party tool

When booting the RHEL installation from a USB that is created using a third party tool, the installer fails to detect the Local Media installation source (only Red Hat CDN is detected).

The USB CD-ROM drive is not available as an installation source in Anaconda

Installation fails when the USB CD-ROM drive is the source for it and the Kickstart ignoredisk --only-use= command is specified. In this case, Anaconda cannot find and use this source disk.

Hard drive partitioned installations with iso9660 filesystem fails

You cannot install RHEL on systems where the hard drive is partitioned with the iso9660 filesystem. This is due to the updated installation code that is set to ignore any hard disk containing a iso9660 file system partition. This happens even when RHEL is installed without using a DVD.

Anaconda fails to verify existence of an administrator user account

While installing RHEL using a graphical user interface, Anaconda fails to verify if the administrator account has been created. As a consequence, users might install a system without any administrator user account.

New XFS features prevent booting of PowerNV IBM POWER systems with firmware older than version 5.10

PowerNV IBM POWER systems use a Linux kernel for firmware, and use Petitboot as a replacement for GRUB. This results in the firmware kernel mounting /boot and Petitboot reading the GRUB config and booting RHEL.

RHEL for Edge installer image fails to create mount points when installing an rpm-ostree payload

When deploying rpm-ostree payloads, used for example in a RHEL for Edge installer image, the installer does not properly create some mount points for custom partitions. As a consequence, the installation is aborted with the following error:

NetworkManager fails to start after the installation when connected to a network but without DHCP or a static IP address configured

Starting with RHEL 9.0, Anaconda activates network devices automatically when there is no specific ip= or Kickstart network configuration set. Anaconda creates a default persistent configuration file for each Ethernet device. The connection profile has the ONBOOT and autoconnect value set to true. As a consequence, during the start of the installed system, RHEL activates the network devices, and the networkManager-wait-online service fails.

Unable to load an updated driver from the driver update disc in the installation environment

A new version of a driver from the driver update disc might not load if the same driver from the installation initial RM disk has already been loaded. As a consequence, an updated version of the driver cannot be applied to the installation environment.

Kickstart installations fail to configure the network connection

Anaconda performs the Kickstart network configuration only through the NetworkManager API. Anaconda processes the network configuration after the %pre Kickstart section. As a consequence, some tasks from the Kickstart %pre section are blocked. For example, downloading packages from the %pre section fails due to unavailability of the network configuration.

Enabling the FIPS mode is not supported when building rpm-ostree images with RHEL image builder

Currently, there is no support to enable the FIPS mode when building rpm-ostree images with RHEL image builder.

Images built with the stig profile remediation fails to boot with FIPS error

FIPS mode is not supported by RHEL image builder. When using RHEL image builder customized with the xccdf_org.ssgproject.content_profile_stig profile remediation, the system fails to boot with the following error:

Driver disk menu fails to display user inputs on the console

When you start RHEL installation using the inst.dd option on the kernel command line with a driver disk, the console fails to display the user input. Consequently, it appears that the application does not respond to the user input and stops responding, but displays the output which is confusing for users. However, this behavior does not affect the functionality, and user input gets registered after pressing Enter.

RHEL installer does not automatically discover or use iSCSI devices as boot devices on aarch64

The absence of the iscsi_ibft kernel module in RHEL installers running on aarch64 prevents automatic discovery of iSCSI devices defined in firmware. These devices are not automatically visible in the installer nor selectable as boot devices when added manually by using the GUI. As a workaround, add the "inst.nonibftiscsiboot" parameter to the kernel command line when booting the installer and then manually attach iSCSI devices through the GUI. As a result, the installer can recognize the attached iSCSI devices as bootable and installation completes as expected.

OpenSSL does not detect if a PKCS #11 token supports the creation of raw RSA or RSA-PSS signatures

The TLS 1.3 protocol requires support for RSA-PSS signatures. If a PKCS #11 token does not support raw RSA or RSA-PSS signatures, server applications that use the OpenSSL library fail to work with an RSA key if the key is held by the PKCS #11 token. As a result, TLS communication fails in the described scenario.

OpenSSL incorrectly handles PKCS #11 tokens that does not support raw RSA or RSA-PSS signatures

The OpenSSL library does not detect key-related capabilities of PKCS #11 tokens. Consequently, establishing a TLS connection fails when a signature is created with a token that does not support raw RSA or RSA-PSS signatures.

With a specific syntax, scp empties files copied to themselves

The scp utility changed from the Secure copy protocol (SCP) to the more secure SSH file transfer protocol (SFTP). Consequently, copying a file from a location to the same location erases the file content. The problem affects the following syntax:

The OSCAP Anaconda add-on does not fetch tailored profiles in the graphical installation

The OSCAP Anaconda add-on does not provide an option to select or deselect tailoring of security profiles in the RHEL graphical installation. Starting from RHEL 8.8, the add-on does not take tailoring into account by default when installing from archives or RPM packages. Consequently, the installation displays the following error message instead of fetching an OSCAP tailored profile:

Ansible remediations require additional collections

With the replacement of Ansible Engine by the ansible-core package, the list of Ansible modules provided with the RHEL subscription is reduced. As a consequence, running remediations that use Ansible content included within the scap-security-guide package requires collections from the rhc-worker-playbook package.

Keylime does not accept concatenated PEM certificates

When Keylime receives a certificate chain as multiple certificates in the PEM format concatenated in a single file, the keylime-agent-rust Keylime component does not correctly use all the provided certificates during signature verification, resulting in a TLS handshake failure. As a consequence, the client components (keylime_verifier and keylime_tenant) cannot connect to the Keylime agent. To work around this problem, use just one certificate instead of multiple certificates.

Keylime refuses runtime policies whose digests start with a backslash

The current script for generating runtime policies, create_runtime_policy.sh, uses SHA checksum functions, for example, sha256sum, to compute the file digest. However, when the input file name contains a backslash or \n, the checksum function adds a backslash before the digest in its output. In such cases, the generated policy file is malformed. When provided with the malformed policy file, the Keylime tenant produces the following or similar error message: me.tenant - ERROR - Response code 400: Runtime policy is malformatted. To work around the problem, remove the backslash from the malformed policy file manually by entering the following command: sed -i 's/^\\//g' <malformed_file_name>.

Keylime agent rejects requests from the verifier after update

When the API version number of the Keylime agent (keylime-agent-rust) has been updated, the agent rejects requests that use a different version. As a consequence, if a Keylime agent is added to a verifier and then updated, the verifier tries to contact the agent using the old API version. The agent rejects this request and fails the attestation. To work around this problem, update the verifier (keylime-verifier) before updating the agent (keylime-agent-rust). As a result, when the agents are updated, the verifier detects the API change and updates its stored data accordingly.

The fapolicyd utility incorrectly allows executing changed files

Correctly, the IMA hash of a file should update after any change to the file, and fapolicyd should prevent execution of the changed file. However, this does not happen due to differences in IMA policy setup and in file hashing by the evctml utility. As a result, the IMA hash is not updated in the extended attribute of a changed file. Consequently, fapolicyd incorrectly allows the execution of the changed file.

Default SELinux policy allows unconfined executables to make their stack executable

The default state of the selinuxuser_execstack boolean in the SELinux policy is on, which means that unconfined executables can make their stack executable. Executables should not use this option, and it might indicate poorly coded executables or a possible attack. However, due to compatibility with other tools, packages, and third-party products, Red Hat cannot change the value of the boolean in the default policy. If your scenario does not depend on such compatibility aspects, you can turn the boolean off in your local policy by entering the command setsebool -P selinuxuser_execstack off.

SSH timeout rules in STIG profiles configure incorrect options

An update of OpenSSH affected the rules in the following Defense Information Systems Agency Security Technical Implementation Guide (DISA STIG) profiles:

GnuPG incorrectly allows using SHA-1 signatures even if disallowed by crypto-policies

The GNU Privacy Guard (GnuPG) cryptographic software can create and verify signatures that use the SHA-1 algorithm regardless of the settings defined by the system-wide cryptographic policies. Consequently, you can use SHA-1 for cryptographic purposes in the DEFAULT cryptographic policy, which is not consistent with the system-wide deprecation of this insecure algorithm for signatures.

OpenSCAP memory-consumption problems

On systems with limited memory, the OpenSCAP scanner might stop prematurely or it might not generate the results files. To work around this problem, you can customize the scanning profile to deselect rules that involve recursion over the entire / file system:

Remediating service-related rules during kickstart installations might fail

During a kickstart installation, the OpenSCAP utility sometimes incorrectly shows that a service enable or disable state remediation is not needed. Consequently, OpenSCAP might set the services on the installed system to a non-compliant state. As a workaround, you can scan and remediate the system after the kickstart installation. This will fix the service-related issues.

The open-vm-tools package is not available in the edge-vsphere image

Currently, the open-vm-tools package is not installed by default in the edge-vsphere image. To workaround this issue, include the package in the blueprint customization. When using the edge-vsphere image type, add the open-vm-tools in the blueprint for the RHEL for Edge Container image or the RHEL for Edge Commit image.

The Installation process sometimes becomes unresponsive

When you install RHEL, the installation process sometimes becomes unresponsive. The /tmp/packaging.log file displays the following message at the end:

Running createrepo_c on local repositories generates duplicate repodata files

When you run the createrepo_c command on local repositories, it generates duplicate copies of repodata files, one of the copies is compressed and one is not. There is no workaround available, however, you can safely ignore the duplicate files. The createrepo_c command generates duplicate copies because of requirements and differences in other tools relying on repositories created by using createrepo_c.

ReaR fails during recovery if the TMPDIR variable is set in the configuration file

Setting and exporting TMPDIR in the /etc/rear/local.conf or /etc/rear/site.conf ReaR configuration file does not work and is deprecated.

Renaming network interfaces using ifcfg files fails

On RHEL 9, the initscripts package is not installed by default. Consequently, renaming network interfaces using ifcfg files fails. To solve this problem, Red Hat recommends that you use udev rules or link files to rename interfaces. For further details, see Consistent network interface device naming and the systemd.link(5) man page.

The chkconfig package is not installed by default in RHEL 9

The chkconfig package, which updates and queries runlevel information for system services, is not installed by default in RHEL 9.

Setting the console keymap requires the libxkbcommon library on your minimal install

In RHEL 9, certain systemd library dependencies have been converted from dynamic linking to dynamic loading, so that your system opens and uses the libraries at runtime when they are available. With this change, a functionality that depends on such libraries is not available unless you install the necessary library. This also affects setting the keyboard layout on systems with a minimal install. As a result, the localectl --no-convert set-x11-keymap gb command fails.

The %vmeff metric from the sysstat package displays incorrect values

The sysstat package provides the %vmeff metric to measure the page reclaim efficiency. The values of the %vmeff column returned by the sar -B command are incorrect because sysstat does not parse all relevant /proc/vmstat values provided by later kernel versions. To work around this problem, you can calculate the %vmeff value manually from the /proc/vmstat file. For details, see Why the sar(1) tool reports %vmeff values beyond 100 % in RHEL 8 and RHEL 9?

The Service Location Protocol (SLP) is vulnerable to an attack through UDP

The OpenSLP provides a dynamic configuration mechanism for applications in local area networks, such as printers and file servers. However, SLP is vulnerable to a reflective denial of service amplification attack through UDP on systems connected to the internet. SLP allows an unauthenticated attacker to register new services without limits set by the SLP implementation. By using UDP and spoofing the source address, an attacker can request the service list, creating a Denial of Service on the spoofed address.

Both bind and unbound disable validation of SHA-1-based signatures

The bind and unbound components disable validation support of all RSA/SHA1 (algorithm number 5) and RSASHA1-NSEC3-SHA1 (algorithm number 7) signatures, and the SHA-1 usage for signatures is restricted in the DEFAULT system-wide cryptographic policy.

named fails to start if the same writable zone file is used in multiple zones

BIND does not allow the same writable zone file in multiple zones. Consequently, if a configuration includes multiple zones which share a path to a file that can be modified by the named service, named fails to start. To work around this problem, use the in-view clause to share one zone between multiple views and make sure to use different paths for different zones. For example, include the view names in the path.

libotr is not compliant with FIPS

The libotr library and toolkit for off-the-record (OTR) messaging provides end-to-end encryption for instant messaging conversations. However, the libotr library does not conform to the Federal Information Processing Standards (FIPS) due to its use of the gcry_pk_sign() and gcry_pk_verify() functions. As a result, you cannot use the libotr library in FIPS mode.

Using the XDP multi buffer mode with the mlx5 driver and a MTU greater than 3498 bytes requires disabling RX Striding RQ

Running an eXpress Data Path (XDP) script with multi buffer mode on a host that matches all of the following conditions fails:

kTLS does not support offloading of TLS 1.3 to NICs

Kernel Transport Layer Security (kTLS) does not support offloading of TLS 1.3 to NICs. Consequently, software encryption is used with TLS 1.3 even when the NICs support TLS offload. To work around this problem, disable TLS 1.3 if offload is required. As a result, you can offload only TLS 1.2. When TLS 1.3 is in use, there is lower performance, since TLS 1.3 cannot be offloaded.

Failure to update the session key causes the connection to break

Kernel Transport Layer Security (kTLS) protocol does not support updating the session key, which is used by the symmetric cipher. Consequently, the user cannot update the key, which causes a connection break. To work around this problem, disable kTLS. As a result, with the workaround, it is possible to successfully update the session key.

The initscripts package is not installed by default

By default, the initscripts package is not installed. As a consequence, the ifup and ifdown utilities are not available. As an alternative, use the nmcli connection up and nmcli connection down commands to enable and disable connections. If the suggested alternative does not work for you, report the problem and install the NetworkManager-initscripts-updown package, which provides a NetworkManager solution for the ifup and ifdown utilities.

The mlx5 driver fails while using the Mellanox ConnectX-5 adapter

In Ethernet switch device driver model (switchdev) mode, the mlx5 driver fails when configured with the device managed flow steering (DMFS) parameter and ConnectX-5 adapter supported hardware. As a consequence, you can see the following error message:

The Intel® i40e adapter permanently fails on IBM Power10

When the i40e adapter encounters an I/O error on IBM Power10 systems, the Enhanced I/O Error Handling (EEH) kernel services trigger the network driver’s reset and recovery. However, EEH repeatedly reports I/O errors until the i40e driver reaches the predefined maximum of EEH freezes. As a consequence, EEH causes the device to fail permanently.  

The xdp-loader features command fails

The xdp-loader utility was compiled against a previous version of libbpf. As a consequence, the xdp-loader features command fails with an error:

The kdump mechanism in kernel causes OOM errors on the 64K kernel

The 64K kernel page size on the 64-bit ARM architecture uses more memory than the 4KB kernel. Consequently, kdump causes a kernel panic and memory allocation fails with out of memory (OOM) errors. As a work around, manually configure the crashkernel value to 640 MB. For example, set the crashkernel= parameter as crashkernel=2G- :640M.

Customer applications with dependencies on kernel page size might need updating when moving from 4k to 64k page size kernel

RHEL is compatible with both 4k and 64k page size kernels. Customer applications with dependencies on a 4k kernel page size might require updating when moving from 4k to 64k page size kernels. Known instances of this include jemalloc and dependent applications.

Upgrading to the latest real-time kernel with dnf does not install multiple kernel versions in parallel

Installing the latest real-time kernel with the dnf package manager requires resolving package dependencies to retain the new and current kernel versions simultaneously. By default, dnf removes the older kernel-rt package during the upgrade.

The Delay Accounting functionality does not display the SWAPIN and IO% statistics columns by default

The Delayed Accounting functionality, unlike early versions, is disabled by default. Consequently, the iotop application does not show the SWAPIN and IO% statistics columns and displays the following warning:

Hardware certification of the real-time kernel on systems with large core-counts might require passing the skew-tick=1 boot parameter

Large or moderate sized systems with numerous sockets and large core-counts can experience latency spikes due to lock contentions on xtime_lock, which is used in the timekeeping system. As a consequence, latency spikes and delays in hardware certifications might occur on multiprocessing systems. As a workaround, you can offset the timer tick per CPU to start at a different time by adding the skew_tick=1 boot parameter.

The kdump mechanism fails to capture the vmcore file on LUKS-encrypted targets

When running kdump on systems with Linux Unified Key Setup (LUKS) encrypted partitions, systems require a certain amount of available memory. When the available memory is less than the required amount of memory, the systemd-cryptsetup service fails to mount the partition. Consequently, the second kernel fails to capture the crash dump file on the LUKS-encrypted targets.

The kdump service fails to build the initrd file on IBM Z systems

On the 64-bit IBM Z systems, the kdump service fails to load the initial RAM disk (initrd) when znet related configuration information such as s390-subchannels reside in an inactive NetworkManager connection profile. Consequently, the kdump mechanism fails with the following error:

The iwl7260-firmware breaks Wi-Fi on Intel Wi-Fi 6 AX200, AX210, and Lenovo ThinkPad P1 Gen 4

After updating the iwl7260-firmware or iwl7260-wifi driver to the version provided by RHEL 9.1 and later, the hardware gets into an incorrect internal state. reports its state incorrectly. Consequently, Intel Wifi 6 cards may not work and display the error message:

weak-modules from kmod fails to work with module inter-dependencies

The weak-modules script provided by the kmod package determines which modules are kABI-compatible with installed kernels. However, while checking modules' kernel compatibility, weak-modules processes modules symbol dependencies from higher to lower release of the kernel for which they were built. As a consequence, modules with inter-dependencies built against different kernel releases might be interpreted as non-compatible, and therefore the weak-modules script fails to work in this scenario.

dkms provides an incorrect warning on program failure with correctly compiled drivers on 64-bit ARM CPUs

The Dynamic Kernel Module Support (dkms) utility does not recognize that the kernel headers for 64-bit ARM CPUs work for both the kernels with 4 kilobytes and 64 kilobytes page sizes. As a result, when the kernel update is performed and the kernel-64k-devel package is not installed, dkms provides an incorrect warning on why the program failed on correctly compiled drivers. To work around this problem, install the kernel-headers package, which contains header files for both types of ARM CPU architectures and is not specific to dkms and its requirements.

Anaconda fails to login iSCSI server using the no authentication method after unsuccessful CHAP authentication attempt

When you add iSCSI discs using CHAP authentication and the login attempt fails due to incorrect credentials, a relogin attempt to the discs with the no authentication method fails. To workaround this problem, close the current session and login using the no authentication method.

Device Mapper Multipath is not supported with NVMe/TCP

Using Device Mapper Multipath with the nvme-tcp driver can result in the Call Trace warnings and system instability. To work around this problem, NVMe/TCP users must enable native NVMe multipathing and not use the device-mapper-multipath tools with NVMe.

The blk-availability systemd service deactivates complex device stacks

In systemd, the default block deactivation code does not always handle complex stacks of virtual block devices correctly. In some configurations, virtual devices might not be removed during the shutdown, which causes error messages to be logged. To work around this problem, deactivate complex block device stacks by executing the following command:

Disabling quota accounting is no longer possible for an XFS filesystem mounted with quotas enabled

Starting with RHEL 9.2, it is no longer possible to disable quota accounting on an XFS filesystem which has been mounted with quotas enabled.

udev rule change for NVMe devices

There is a udev rule change for NVMe devices that adds OPTIONS="string_escape=replace" parameter. This leads to a disk by-id naming change for some vendors, if the serial number of your device has leading whitespace.

NVMe/FC devices cannot be reliably used in a Kickstart file

NVMe/FC devices can be unavailable during parsing or execution of pre-scripts of the Kickstart file, which can cause the Kickstart installation to fail. To work around this issue, update the boot argument to inst.wait_for_disks=30. This option causes a delay of 30 seconds, and should provide enough time for the NVMe/FC device to connect. With this workaround along with the NVMe/FC devices connecting in time, the Kickstart installation proceeds without issues.

Kernel panic while using the qedi driver

While using the qedi iSCSI driver, the kernel panics after OS boots. To work around this issue, disable the kfence runtime memory error detector feature by adding kfence.sample_interval=0 to the kernel boot command line.

Unable to boot ARM based system with kernel-64k page size

While installing the vdo package, a kernel with 4k page size is installed as a dependency. As a consequence, the system boots with the 4k page size kernel even if you select 64k page size on the Software Selection screen. To work around this issue, select Minimal Install under Base Environment and 64k as page size under Kernel options. When the system boots for the first time, install additional softwares using the DNF package manager.

python3.11-lxml does not provide the lxml.isoschematron submodule

The python3.11-lxml package is distributed without the lxml.isoschematron submodule because it is not under an open source license. The submodule implements ISO Schematron support. As an alternative, pre-ISO-Schematron validation is available in the lxml.etree.Schematron class. The remaining content of the python3.11-lxml package is unaffected.

The --ssl-fips-mode option in MySQL and MariaDB does not change FIPS mode

The --ssl-fips-mode option in MySQL and MariaDB in RHEL works differently than in upstream.

MIT Kerberos does not support ECC certificates for PKINIT

MIT Kerberos does not implement the RFC5349 request for comments document, which describes the design of elliptic-curve cryptography (ECC) support in Public Key Cryptography for initial authentication (PKINIT). Consequently, the MIT krb5-pkinit package, used by RHEL, does not support ECC certificates. For more information, see Elliptic Curve Cryptography (ECC) Support for Public Key Cryptography for Initial Authentication in Kerberos (PKINIT).

The DEFAULT:SHA1 subpolicy has to be set on RHEL 9 clients for PKINIT to work against AD KDCs

The SHA-1 digest algorithm has been deprecated in RHEL 9, and CMS messages for Public Key Cryptography for initial authentication (PKINIT) are now signed with the stronger SHA-256 algorithm.

The PKINIT authentication of a user fails if a RHEL 9 Kerberos agent communicates with a non-RHEL-9 and non-AD Kerberos agent

If a RHEL 9 Kerberos agent, either a client or Kerberos Distribution Center (KDC), interacts with a non-RHEL-9 Kerberos agent that is not an Active Directory (AD) agent, the PKINIT authentication of the user fails. To work around the problem, perform one of the following actions:

Heimdal client fails to authenticate a user using PKINIT against RHEL 9 KDC

By default, a Heimdal Kerberos client initiates the PKINIT authentication of an IdM user by using Modular Exponential (MODP) Diffie-Hellman Group 2 for Internet Key Exchange (IKE). However, the MIT Kerberos Distribution Center (KDC) on RHEL 9 only supports MODP Group 14 and 16.

IdM in FIPS mode does not support using the NTLMSSP protocol to establish a two-way cross-forest trust

Establishing a two-way cross-forest trust between Active Directory (AD) and Identity Management (IdM) with FIPS mode enabled fails because the New Technology LAN Manager Security Support Provider (NTLMSSP) authentication is not FIPS-compliant. IdM in FIPS mode does not accept the RC4 NTLM hash that the AD domain controller uses when attempting to authenticate.

IdM Vault encryption and decryption fails in FIPS mode

The OpenSSL RSA-PKCS1v15 padding encryption is blocked if FIPS mode is enabled. Consequently, Identity Management (IdM) Vaults fail to work correctly as IdM is currently using the PKCS1v15 padding for wrapping the session key with the transport certificate.

Users without SIDs cannot log in to IdM after an upgrade

After upgrading your IdM replica to RHEL 9.2, the IdM Kerberos Distribution Center (KDC) might fail to issue ticket-granting tickets (TGTs) to users who do not have Security Identifiers (SIDs) assigned to their accounts. Consequently, the users cannot log in to their accounts.

Migrated IdM users might be unable to log in due to mismatching domain SIDs

If you have used the ipa migrate-ds script to migrate users from one IdM deployment to another, those users might have problems using IdM services because their previously existing Security Identifiers (SIDs) do not have the domain SID of the current IdM environment. For example, those users can retrieve a Kerberos ticket with the kinit utility, but they cannot log in. To work around this problem, see the following Knowledgebase article: Migrated IdM users unable to log in due to mismatching domain SIDs.

MIT krb5 user fails to obtain an AD TGT because of incompatible encryption types generating the user PAC

In MIT krb5 1.20 and later packages, a Privilege Attribute Certificate (PAC) is included in all Kerberos tickets by default. The MIT Kerberos Distribution Center (KDC) selects the strongest encryption type available to generate the KDC checksum in the PAC, which currently is the AES HMAC-SHA2 encryption types defined in RFC8009. However, Active Directory (AD) does not support this RFC. Consequently, in an AD-MIT cross-realm setup, an MIT krb5 user fails to obtain an AD ticket-granting ticket (TGT) because the cross-realm TGT generated by MIT KDC contains an incompatible KDC checksum type in the PAC.

Potential risk when using the default value for ldap_id_use_start_tls option

When using ldap:// without TLS for identity lookups, it can pose a risk for an attack vector. Particularly a man-in-the-middle (MITM) attack which could allow an attacker to impersonate a user by altering, for example, the UID or GID of an object returned in an LDAP search.

Adding a RHEL 9 replica in FIPS mode to an IdM deployment in FIPS mode that was initialized with RHEL 8.6 or earlier fails

The default RHEL 9 FIPS cryptographic policy aiming to comply with FIPS 140-3 does not allow the use of the AES HMAC-SHA1 encryption types' key derivation function as defined by RFC3961, section 5.1.

SSSD registers the DNS names properly

Previously, if the DNS was set up incorrectly, SSSD always failed the first attempt to register the DNS name. To work around the problem, this update provides a new parameter dns_resolver_use_search_list. Set dns_resolver_use_search_list = false to avoid using the DNS search list.

Installing a RHEL 7 IdM client with a RHEL 9.2+ IdM server in FIPS mode fails due to EMS enforcement

The TLS Extended Master Secret (EMS) extension (RFC 7627) is now mandatory for TLS 1.2 connections on FIPS-enabled RHEL 9.2 and later systems. This is in accordance with FIPS-140-3 requirements. However, the openssl version available in RHEL 7.9 and lower does not support EMS. In consequence, installing a RHEL 7 Identity Management (IdM) client with a FIPS-enabled IdM server running on RHEL 9.2 and later fails.

When the nsslapd-numlisteners attribute value is more than 2, Directory Server fails

If the nsslapd-numlisteners attribute value is higher than 2, Directory Server might close the listening file descriptor instead of the accepted file descriptor. As a result, after some time, Directory Server stops listening on some ports and fails.

A workaround to preserve IdM-AD interoperability in RHEL 9 is now available

In RHEL 9, the FIPS-140-3 standard does not allow SHA-1 signatures. Consequently, a trust between Active Directory (AD) and Identity Management (IdM) in FIPS mode cannot be established as AD only complies with the older FIPS-140-2 standard and therefore requires SHA-1 signatures.

VNC is not running after upgrading to RHEL 9

After upgrading from RHEL 8 to RHEL 9, the VNC server fails to start, even if it was previously enabled.

User Creation screen is unresponsive

When installing RHEL using a graphical user interface, the User Creation screen is unresponsive. As a consequence, creating users during installation is more difficult.

WebKitGTK fails to display web pages on IBM Z

The WebKitGTK web browser engine fails when trying to display web pages on the IBM Z architecture. The web page remains blank and the WebKitGTK process ends unexpectedly.

NVIDIA drivers might revert to X.org

Under certain conditions, the proprietary NVIDIA drivers disable the Wayland display protocol and revert to the X.org display server:

Night Light is not available on Wayland with NVIDIA

When the proprietary NVIDIA drivers are enabled on your system, the Night Light feature of GNOME is not available in Wayland sessions. The NVIDIA drivers do not currently support Night Light.

X.org configuration utilities do not work under Wayland

X.org utilities for manipulating the screen do not work in the Wayland session. Notably, the xrandr utility does not work under Wayland due to its different approach to handling, resolutions, rotations, and layout.

If firewalld.service is masked, using the firewall RHEL system role fails

If firewalld.service is masked on a RHEL system, the firewall RHEL system role fails. To work around this problem, unmask the firewalld.service:

Unable to register systems with environment names

The rhc system role fails to register the system when specifying environment names in rhc_environment. As a workaround, use environment IDs instead of environment names while registering.

Installing a virtual machine over https or ssh in some cases fails

Currently, the virt-install utility fails when attempting to install a guest operating system (OS) from an ISO source over a https or ssh connection - for example using virt-install --cdrom https://example/path/to/image.iso. Instead of creating a virtual machine (VM), the described operation ends unexpectedly with an internal error: process exited while connecting to monitor message.

Using NVIDIA drivers in virtual machines disables Wayland

Currently, NVIDIA drivers are not compatible with the Wayland graphical session. As a consequence, RHEL guest operating systems that use NVIDIA drivers automatically disable Wayland and load an Xorg session instead. This primarily occurs in the following scenarios:

The Milan VM CPU type is sometimes not available on AMD Milan systems

On certain AMD Milan systems, the Enhanced REP MOVSB (erms) and Fast Short REP MOVSB (fsrm) feature flags are disabled in the BIOS by default. Consequently, the Milan CPU type might not be available on these systems. In addition, VM live migration between Milan hosts with different feature flag settings might fail. To work around these problems, manually turn on erms and fsrm in the BIOS of your host.

A hostdev interface with failover settings cannot be hot-plugged after being hot-unplugged

After removing a hostdev network interface with failover configuration from a running virtual machine (VM), the interface currently cannot be re-attached to the same running VM.

Live post-copy migration of VMs with failover VFs fails

Currently, attempting to post-copy migrate a running virtual machine (VM) fails if the VM uses a device with the virtual function (VF) failover capability enabled. To work around the problem, use the standard migration type, rather than post-copy migration.

Host network cannot ping VMs with VFs during live migration

When live migrating a virtual machine (VM) with a configured virtual function (VF), such as a VMs that uses virtual SR-IOV software, the network of the VM is not visible to other devices and the VM cannot be reached by commands such as ping. After the migration is finished, however, the problem no longer occurs.

Disabling AVX causes VMs to become unbootable

On a host machine that uses a CPU with Advanced Vector Extensions (AVX) support, attempting to boot a VM with AVX explicitly disabled currently fails, and instead triggers a kernel panic in the VM.

Windows VM fails to get IP address after network interface reset

Sometimes, Windows virtual machines fail to get an IP address after an automatic network interface reset. As a consequence, the VM fails to connect to the network. To work around this problem, disable and re-enable the network adapter driver in the Windows Device Manager.

Windows Server 2016 VMs sometimes stops working after hot-plugging a vCPU

Currently, assigning a vCPU to a running virtual machine (VM) with a Windows Server 2016 guest operating system might cause a variety of problems, such as the VM terminating unexpectedly, becoming unresponsive, or rebooting.

Using a large number of queues might cause VMs to fail

Virtual machines (VMs) might fail when the virtual Trusted Platform Module (vTPM) device is enabled and the multi-queue virtio-net feature is configured to use more than 250 queues.

Redundant error messages on VMs with NVIDIA passthrough devices

When using an Intel host machine with a RHEL 9.2 and later operating system, virtual machines (VMs) with a passed through NVDIA GPU device frequently log the following error message:

Some Windows guests fail to boot after a v2v conversion on hosts with AMD EPYC CPUs

After using the virt-v2v utility to convert a virtual machine (VM) that uses Windows 11 or a Windows Server 2022 as the guest OS, the VM currently fails to boot. This occurs on hosts that use AMD EPYC series CPUs.

Restarting the OVS service on a host might block network connectivity on its running VMs

When the Open vSwitch (OVS) service restarts or crashes on a host, virtual machines (VMs) that are running on this host cannot recover the state of the networking device. As a consequence, VMs might be completely unable to receive packets.

Recovering an interrupted post-copy VM migration might fail

If a post-copy migration of a virtual machine (VM) is interrupted and then immediately resumed on the same incoming port, the migration might fail with the following error: Address already in use

NUMA node mapping not working correctly on AMD EPYC CPUs

QEMU does not handle NUMA node mapping on AMD EPYC CPUs correctly. As a result, the performance of virtual machines (VMs) with these CPUs might be negatively impacted if using a NUMA node configuration. In addition, the VMs display a warning similar to the following during boot.

NFS failure during VM migration causes migration failure and source VM coredump

Currently, if the NFS service or server is shut down during virtual machine (VM) migration, the source VM’s QEMU is unable to reconnect to the NFS server when it starts running again. As a result, the migration fails and a coredump is initiated on the source VM. Currently, there is no workaround available.

PCIe ATS devices do not work on Windows VMs

When you configure a PCIe Address Translation Services (ATS) device in the XML configuration of virtual machine (VM) with a Windows guest operating system, the guest does not enable the ATS device after booting the VM. This is because Windows currently does not support ATS on virtio devices.

virsh blkiotune --weight command fails to set the correct cgroup I/O controller value

Currently, using the virsh blkiotune --weight command to set the VM weight does not work as expected. The command fails to set the correct io.bfq.weight value in the cgroup I/O controller interface file. There is no workaround at this time.

Starting a VM with an NVIDIA A16 GPU sometimes causes the host GPU to stop working

Currently, if you start a VM that uses an NVIDIA A16 GPU passthrough device, the NVIDIA A16 GPU physical device on the host system in some cases stops working.

RT VMs with a FIFO scheduler cannot boot

Currently, after setting a real-time (RT) virtual machine (VM) to use the fifo setting for the vCPU scheduler, the VM becomes unresponsive when you attempt to boot it. Instead, the VM displays the Guest has not initialized the display (yet) error.

Windows VMs might become unresponsive due to storage errors

On virtual machines (VMs) that use Windows guest operating systems, the system in some cases becomes unresponsive when under high I/O load. When this happens, the system logs a viostor Reset to device, \Device\RaidPort3, was issued error.

Windows 10 VMs with certain PCI devices might become unresponsive on boot

Currently, a virtual machine (VM) that uses a Windows 10 guest operating system might become unresponsive during boot if a virtio-win-scsi PCI device with a local disk back end is attached to the VM. To work around the problem, boot the VM with the multi_queue option enabled.

The repair function of virtio-win-guest-tool for the virtio-win drivers does not work

Currently, when using the Repair button of virtio-win-guest-tool for a virtio-win driver, such as the Virtio Balloon Driver, the button has no effect. As a consequence, the driver cannot be reinstalled after being removed on the guest.

Windows 11 VMs with a memory balloon device set might close unexpectedly during reboot

Currently, rebooting virtual machines (VMs) that use a Windows 11 guest operating system and a memory balloon device in some cases fails with a DRIVER POWER STAT FAILURE blue-screen error.

Migrating a Windows 11 or Windows Server 2022 VM under high network load sometimes fails

When live-migrating a virtual machine (VM) that uses Windows Server 2022 or Windows 11 as the guest operating system, the migration might become unresponsive or terminate unexpectedly if the network is impacted by high packed loss.

Resuming a postcopy VM migration fails in some cases

Currently, when performing a postcopy migration of a virtual machine (VM), if a proxy network failure occurs during the RECOVER phase of the migration, the VM becomes unresponsive and the migration cannot be resumed. Instead, the recovery command displays the following error:

The virtio balloon driver sometimes does not work on Windows 10 VMs

Under certain circumstances, the virtio-balloon driver does not work correctly on virtual machines (VMs) that use a Windows 10 guest operating system. As a consequence, such VMs might not use their assigned memory efficiently.

The virtio file system has suboptimal performance in Windows VMs

Currently, when a virtio file system (virtiofs) is configured on a virtual machine (VM) that uses a Windows guest operating system, the performance of virtiofs in the VM is significantly worse than in VMs that use Linux guests.

Hot-unplugging a storage device on Windows VMs might fail

On virtual machines (VMs) that use a Windows guest operating system, removing a storage device when the VM is running (also known as a device hot-unplug) in some cases fails. As a consequence, the storage device remains attached to the VM and the disk manager service might become unresponsive.

Hot plugging CPUs to a Windows VM might cause a system failure

When hot plugging the maximum number of CPUs to a Windows virtual machine (VM) with huge pages enabled, the guest operating system might crash with the following Stop error:

Updating virtio drivers on Windows VMs might fail

When updating the KVM paravirtualized (virtio) drivers on a Windows virtual machine (VM), the update might cause the mouse to stop working and the newly installed drivers might not be signed. This problem occurs when updating the virtio drivers by installing from the virtio-win-guest-tools package, which is a part of the virtio-win.iso file.

Kdump fails on virtual machines with AMD SEV-SNP

Currently, kdump fails on RHEL 9 virtual machines (VMs) that use the AMD Secure Encrypted Virtualization (SEV) with the Secure Nested Paging (SNP) feature.

Cloning or restoring RHEL 9 virtual machines that use LVM on Nutanix AHV causes non-root partitions to disappear

When running a RHEL 9 guest operating system on a virtual machine (VM) hosted on the Nutanix AHV hypervisor, restoring the VM from a snapshot or cloning the VM currently causes non-root partitions in the VM to disappear if the guest is using Logical Volume Management (LVM). As a consequence, the following problems occur:

Customizing RHEL 9 guests on ESXi sometimes causes networking problems

Currently, customizing a RHEL 9 guest operating system in the VMware ESXi hypervisor does not work correctly with NetworkManager key files. As a consequence, if the guest is using such a key file, it will have incorrect network settings, such as the IP address or the gateway.

RHEL instances on Azure fail to boot if provisioned by cloud-init and configured with an NFSv3 mount entry

Currently, booting a RHEL virtual machine (VM) on the Microsoft Azure cloud platform fails if the VM was provisioned by the cloud-init tool and the guest operating system of the VM has an NFSv3 mount entry in the /etc/fstab file.

Setting static IP in a RHEL virtual machine on a VMware host does not work

Currently, when using RHEL as a guest operating system of a virtual machine (VM) on a VMware host, the DatasourceOVF function does not work correctly. As a consequence, if you use the cloud-init utility to set the VM’s network to static IP and then reboot the VM, the VM’s network will be changed to DHCP.

Large VMs might fail to boot into the debug kernel when the kmemleak option is enabled

When attempting to boot a RHEL 9 virtual machine (VM) into the debug kernel, the booting might fail with the following error if the machine kernel is using the kmemleak=on argument.

Timeout when running sos report on IBM Power Systems, Little Endian

When running the sos report command on IBM Power Systems, Little Endian with hundreds or thousands of CPUs, the processor plugin reaches its default timeout of 300 seconds when collecting huge content of the /sys/devices/system/cpu directory. As a workaround, increase the plugin’s timeout accordingly:

Running systemd within an older container image does not work

Running systemd within an older container image, for example, centos:7, does not work: