RHSA-2026:39983 - 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 Moderate. 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: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
• kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)
• kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113)
• kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)
• kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359)

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.

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 - 2464369 - CVE-2026-43027 kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup
• BZ - 2480453 - CVE-2026-43499 kernel: rtmutex: Use waiter::task instead of current in remove_waiter()
• BZ - 2482587 - CVE-2026-46113 kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
• BZ - 2492805 - CVE-2026-53166 kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock
• BZ - 2497033 - CVE-2026-53359 kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role

CVEs

• CVE-2026-43027
• CVE-2026-43499
• CVE-2026-46113
• CVE-2026-53166
• CVE-2026-53359

References

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