RHSA-2026:91585 - Security Advisory

Topic

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.

Description

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.

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

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2425039 - CVE-2025-68745 kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset
• BZ - 2464093 - CVE-2026-31692 kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns
• BZ - 2479812 - CVE-2026-43493 kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests
• BZ - 2484477 - CVE-2026-46259 kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()
• BZ - 2492364 - CVE-2026-52972 kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000
• BZ - 2502243 - CVE-2026-63831 kernel: mac802154: llsec: add skb_cow_data() before in-place crypto
• BZ - 2507061 - CVE-2026-64320 kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
• BZ - 2516684 - CVE-2026-72243 kernel: selinux: check connect-related permissions on TCP Fast Open
• BZ - 2535391 - CVE-2026-89846 kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read
• BZ - 2540872 - kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation

CVEs

• CVE-2025-68745
• CVE-2026-31692
• CVE-2026-43493
• CVE-2026-46259
• CVE-2026-52972
• CVE-2026-63831
• CVE-2026-64320
• CVE-2026-72243
• CVE-2026-89846

References

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