RHSA-2026:35863 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

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: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270)
• kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)
• kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)
• kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing (CVE-2026-43279)
• kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198)
• kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
• kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
• kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090)
• kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852)
• kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)

Bug Fix(es) and Enhancement(s):

• NVMe-FC: Panic during NVMe Controller Reset tests (JIRA:RHEL-178449)

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.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.8 x86_64
• Red Hat Enterprise Linux Server - TUS 8.8 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.8 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8 x86_64

Fixes

• BZ - 2448745 - CVE-2026-23270 kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation
• BZ - 2454810 - CVE-2026-23455 kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()
• BZ - 2461503 - CVE-2026-31669 kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
• BZ - 2467215 - CVE-2026-43279 kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing
• BZ - 2467228 - CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()
• BZ - 2467234 - CVE-2026-43125 kernel: dlm: validate length in dlm_search_rsb_tree
• BZ - 2468124 - CVE-2026-43329 kernel: netfilter: flowtable: strictly check for maximum number of actions
• BZ - 2481980 - CVE-2026-46090 kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop
• BZ - 2482166 - CVE-2026-45852 kernel: RDMA/rxe: Fix double free in rxe_srq_from_init
• BZ - 2482532 - CVE-2026-46181 kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

CVEs

• CVE-2026-23270
• CVE-2026-23455
• CVE-2026-31669
• CVE-2026-43125
• CVE-2026-43198
• CVE-2026-43279
• CVE-2026-43329
• CVE-2026-45852
• CVE-2026-46090
• CVE-2026-46181

References

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