RHSA-2026:91639 - Security Advisory

Topic

An update for multiple packages is now available for Red Hat Enterprise Linux 9.4 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

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-5.14.0-427.100.1.el9_4.

Security Fix(es):

• kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)
• kernel: pppoe: reload header pointer after dev_hard_header() (CVE-2026-68121)
• kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480)
• kernel: packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)
• kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844)

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 Server - AUS 9.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le

Fixes

• BZ - 2485368 - CVE-2026-53266 kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite
• BZ - 2513233 - CVE-2026-68121 kernel: pppoe: reload header pointer after dev_hard_header()
• BZ - 2517046 - CVE-2026-74480 kernel: net: bridge: stop fast-leave after deleting a port group
• BZ - 2519475 - CVE-2026-74582 kernel: packet: use consistent hard_header_len in non-ring send paths
• BZ - 2528676 - CVE-2026-80844 kernel: xfrm: ah6: validate routing header segments_left

CVEs

• CVE-2026-53266
• CVE-2026-68121
• CVE-2026-74480
• CVE-2026-74582
• CVE-2026-80844

References

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