RHSA-2026:71657HighCVSS 8.3

Red Hat Security Advisory: kernel-rt security update

Published
September 24, 2026
Last Modified
September 27, 2026

🔗 CVE IDs covered (6)

CVE-2026-81000 →CVE-2025-39964 →CVE-2026-53266 →CVE-2026-68121 →CVE-2026-74469 →CVE-2026-80844 →

📋 Description

CVE-2025-39964 — kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg CVE-2026-53266 — kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite CVE-2026-68121 — kernel: pppoe: reload header pointer after dev_hard_header() CVE-2026-74469 — kernel: sctp: prevent peer transport count overflow CVE-2026-80844 — kernel: xfrm: ah6: validate routing header segments_left CVE-2026-81000 — kernel: net: tun: bound receive headroom

🎯 Affected products13

  • Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7.src as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-debuginfo-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-devel-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debuginfo-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-devel-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-doc-0:3.10.0-1160.164.1.rt56.1316.el7.noarch as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-debuginfo-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-devel-0:3.10.0-1160.164.1.rt56.1316.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)

✅ Remediation

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. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: Disable ARP hardware address rewriting in ebtables SNAT rules, or remove ebtables SNAT rules that operate on ARP traffic on bridge interfaces. Workaround: See the security bulletin for a detailed mitigation procedure.

🔗 References (9)