RHSA-2026:91585 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset (CVE-2025-68745)

• kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns (CVE-2026-31692)

• kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests (CVE-2026-43493)

• kernel: Linux kernel: xfrm single-frag length not properly limited ()

• kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)

• kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 (CVE-2026-52972)

• kernel: mac802154: llsec: add skb_cow_data() before in-place crypto (CVE-2026-63831)

• kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page (CVE-2026-64320)

• kernel: selinux: check connect-related permissions on TCP Fast Open (CVE-2026-72243)

• kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read (CVE-2026-89846)

• kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()

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.