RHSA-2026:27713HighCVSS 7.8

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Published
June 22, 2026
Last Modified
August 17, 2026

🔗 CVE IDs covered (8)

CVE-2026-43329 →CVE-2026-43501 →CVE-2026-45852 →CVE-2026-46173 →CVE-2026-46331 →CVE-2026-23455 →CVE-2026-31669 →CVE-2026-43128 →

📋 Description

CVE-2026-23455 — kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() CVE-2026-31669 — kernel: mptcp: fix slab-use-after-free in __inet_lookup_established CVE-2026-43128 — kernel: RDMA/umem: Fix double dma_buf_unpin in failure path CVE-2026-43329 — kernel: netfilter: flowtable: strictly check for maximum number of actions CVE-2026-43501 — kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows CVE-2026-45852 — kernel: RDMA/rxe: Fix double free in rxe_srq_from_init CVE-2026-46173 — kernel: exit: prevent preemption of oopsing TASK_DEAD task CVE-2026-46331 — kernel: net/sched: act_pedit: extend the writable skb range per key

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • Red Hat Enterprise Linux Real Time E4S (v.9.4)
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)
  • bpftool-0:7.3.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-0:7.3.0-427.134.1.el9_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-0:7.3.0-427.134.1.el9_4.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-0:7.3.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux Real Time E4S (v.9.4)
  • bpftool-debuginfo-0:7.3.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)
  • kernel-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-0:5.14.0-427.134.1.el9_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-0:5.14.0-427.134.1.el9_4.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-0:5.14.0-427.134.1.el9_4.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-0:5.14.0-427.134.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-core-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-debug-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-debug-core-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-debug-debuginfo-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • kernel-64k-debug-debuginfo-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • kernel-64k-debug-devel-0:5.14.0-427.134.1.el9_4.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • +170 more not shown

✅ 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. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: To mitigate this issue, disable IPv6 Source Routing by setting the `accept_source_route` sysctl parameter to 0 for all IPv6 interfaces. This can prevent the kernel from processing IPv6 Source Routing Headers, thereby avoiding the vulnerable code path. To disable IPv6 Source Routing: `sysctl -w net.ipv6.conf.all.accept_source_route=0` `sysctl -w net.ipv6.conf.default.accept_source_route=0` To make this change persistent across reboots, add the following lines to `/etc/sysctl.d/99-disable-ipv6-srh.conf`: `net.ipv6.conf.all.accept_source_route = 0` `net.ipv6.conf.default.accept_source_route = 0` Then, apply the changes with: `sysctl --system` Disabling IPv6 Source Routing may impact network configurations that rely on this feature. Workaround: See the security bulletin for a detailed mitigation procedure.

🔗 References (11)