RHSA-2026:53990 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 9.6 Extended Update 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.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath (CVE-2026-43112)

• kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518)

• kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)

Bug Fix(es) and Enhancement(s):

• [HPE-PL 9.9 Bug] Kernel call trace observed when access Intel Granite Rapids-D UART [rhel-9.6.z] (JIRA:RHEL-185342)

• [RHEL 9.4] Kernel memory reclaim bug [rhel-9.6.z] (JIRA:RHEL-211056)

• general protection fault during exportfs / nfsd4_revoke_states [rhel-9.6.z] (JIRA:RHEL-188255)

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.