RHSA-2026:36533 - 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-5.14.0-427.68.2.el9_4.

Security Fix(es):

• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)
• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)
• kernel: Linux kernel: Use-after-free in bonding driver leads to denial of service (CVE-2026-31419)

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 - 2453803 - CVE-2026-23401 kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling
• BZ - 2454844 - CVE-2026-31402 kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache
• BZ - 2457829 - CVE-2026-31419 kernel: Linux kernel: Use-after-free in bonding driver leads to denial of service

CVEs

• CVE-2026-23401
• CVE-2026-31402
• CVE-2026-31419

References

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