RHSA-2026:14869 - 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: out-of-bound read in memcpy_fromiovecend() (CVE-2018-16885)
• kernel: sctp: avoid NULL dereference when chunk data buffer is missing (CVE-2025-40240)
• kernel: ALSA: aloop: Fix racy access at PCM trigger (CVE-2026-23191)
• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)

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 - 1661503 - CVE-2018-16885 kernel: out-of-bound read in memcpy_fromiovecend()
• BZ - 2418832 - CVE-2025-40240 kernel: sctp: avoid NULL dereference when chunk data buffer is missing
• BZ - 2439947 - CVE-2026-23191 kernel: ALSA: aloop: Fix racy access at PCM trigger
• BZ - 2454844 - CVE-2026-31402 kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache

CVEs

• CVE-2018-16885
• CVE-2025-40240
• CVE-2026-23191
• CVE-2026-31402

References

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