RHSA-2026:82860 - 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: xfrm: hold dev ref until after transport_finish NF_HOOK (CVE-2026-31663)
• kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)
• kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate() (CVE-2026-63921)
• kernel: xfrm: input: hold netns during deferred transport reinjection (CVE-2026-63919)
• kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink() (CVE-2026-63917)
• kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment (CVE-2026-68426)
• kernel: nvmet-auth: reject short AUTH_RECEIVE buffers (CVE-2026-72130)
• kernel: udp: fix potential use-after-free in tunnel segmentation (CVE-2026-74705)

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 - 2461462 - CVE-2026-31663 kernel: xfrm: hold dev ref until after transport_finish NF_HOOK
• BZ - 2492779 - CVE-2026-53239 kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
• BZ - 2502368 - CVE-2026-63921 kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate()
• BZ - 2502412 - CVE-2026-63919 kernel: xfrm: input: hold netns during deferred transport reinjection
• BZ - 2502434 - CVE-2026-63917 kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink()
• BZ - 2513477 - CVE-2026-68426 kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment
• BZ - 2516448 - CVE-2026-72130 kernel: nvmet-auth: reject short AUTH_RECEIVE buffers
• BZ - 2521498 - CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation

CVEs

• CVE-2026-31663
• CVE-2026-53239
• CVE-2026-63917
• CVE-2026-63919
• CVE-2026-63921
• CVE-2026-68426
• CVE-2026-72130
• CVE-2026-74705

References

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