RHSA-2026:95587 - Security Advisory

Topic

An update for multiple packages is now available for Red Hat Enterprise Linux 8.

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

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-553.109.1.el8_10.

Security Fix(es):

• kernel: ipc: limit next_id allocation to the valid ID range (CVE-2026-52923)
• kernel: udp: fix potential use-after-free in tunnel segmentation (CVE-2026-74705)
• kernel: net: tun: bound receive headroom (CVE-2026-81000)

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

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le

Fixes

• BZ - 2492094 - CVE-2026-52923 kernel: ipc: limit next_id allocation to the valid ID range
• BZ - 2521498 - CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
• BZ - 2532176 - CVE-2026-81000 kernel: net: tun: bound receive headroom

CVEs

• CVE-2026-52923
• CVE-2026-74705
• CVE-2026-81000

References

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