RHSA-2026:50979: Important: kernel-rt security, bug fix, and enhancement update
Important: kernel-rt security, bug fix, and enhancement update
Other sources
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.Security Fix(es): kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518) Bug Fix(es) and Enhancement(s): Kernel crash in bpfforeacharrayelem() due to missing backport of upstream commit 4b6313cf99b0 (JIRA:RHEL-191844) gfs2: xfstests generic/363 failure [rhel-8.10.z] (JIRA:RHEL-214099) RHEL8: HYPERV hvstorvsc driver can we add additional code to allow PERSISTENTRESERVEIN [RHEL 8.10Z] (JIRA:RHEL-188270) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/kernel-rtto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-coreto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debugto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-coreto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-debuginfoto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-develto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-modulesto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-modules-extrato a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debuginfoto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-develto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-modulesto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-modules-extrato a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-kvmto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-kvmto a version that resolves this vulnerability.Fixed in 4.18.0-553.153.1.rt7.494.el8_10 - Upgrade
Upgrade
kernel-rtto a version that resolves this vulnerability.Patch JIRA:RHEL-191844 - Upgrade
Upgrade
kernel-rtto a version that resolves this vulnerability.Patch CVE-2025-54518 - Compensating control
Reboot the system after applying the kernel-rt update so the changes from the advisory take effect.
Event History
Frequently Asked Questions
What is the severity of RHSA-2026:50979?
The severity of RHSA-2026:50979 is categorized as high with a score of 7.
How do I fix RHSA-2026:50979?
To fix RHSA-2026:50979, update the kernel-rt packages to the latest version provided by Red Hat.
What are the main security issues addressed in RHSA-2026:50979?
RHSA-2026:50979 addresses a privilege escalation vulnerability via improper CPU cache handling in AMD Zen 2 processors.
Which systems are affected by RHSA-2026:50979?
RHSA-2026:50979 affects Red Hat Enterprise Linux for Real Time and Extended Life Cycle systems utilizing the kernel-rt packages.
Can RHSA-2026:50979 impact system performance?
While RHSA-2026:50979 primarily addresses security vulnerabilities, any kernel update can have performance implications, so testing is recommended.