RHSA-2026:51604 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
• kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)
• kernel: gfs2: Fix use-after-free in iomap inline data write path (CVE-2026-45984)
• kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources (CVE-2025-10263)
• kernel: ipc: limit next_id allocation to the valid ID range (CVE-2026-52923)
• kernel: net: openvswitch: reject oversized nested action attrs (CVE-2026-64531)

Bug Fix(es) and Enhancement(s):

• qemu-kvm: error: failed to set MSR 0xc0000102 to 0xff4547ceb1600000 [RHEL.9.2.z] (JIRA:RHEL-126981)
• [RHEL9.2-z] observe hang with nvme/051 test (JIRA:RHEL-129407)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 x86_64

Fixes

• BZ - 2406712 - CVE-2025-40026 kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O
• BZ - 2464092 - CVE-2026-31787 kernel: xen/privcmd: fix double free via VMA splitting
• BZ - 2481922 - CVE-2026-45984 kernel: gfs2: Fix use-after-free in iomap inline data write path
• BZ - 2486958 - CVE-2025-10263 kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources
• BZ - 2492094 - CVE-2026-52923 kernel: ipc: limit next_id allocation to the valid ID range
• BZ - 2507402 - CVE-2026-64531 kernel: net: openvswitch: reject oversized nested action attrs

CVEs

• CVE-2025-10263
• CVE-2025-40026
• CVE-2026-31787
• CVE-2026-45984
• CVE-2026-52923
• CVE-2026-64531

References

• https://access.redhat.com/security/updates/classification/#important