RHSA-2026:41234 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

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: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
• kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)
• kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116)
• kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)

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 Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 2461757 - CVE-2026-31684 kernel: net: sched: act_csum: validate nested VLAN headers
• BZ - 2480453 - CVE-2026-43499 kernel: rtmutex: Use waiter::task instead of current in remove_waiter()
• BZ - 2482523 - CVE-2026-46116 kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete
• BZ - 2492805 - CVE-2026-53166 kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock

CVEs

• CVE-2026-31684
• CVE-2026-43499
• CVE-2026-46116
• CVE-2026-53166

References

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