RHSA-2026:55761HighCVSS 7.8

Red Hat Security Advisory: kpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_130_1, kpatch-patch-4_18_0-477_143_1, and kpatch-patch-4_18_0-477_97_1 security update

Published
August 19, 2026
Last Modified
August 19, 2026

🔗 CVE IDs covered (4)

CVE-2026-64530 →CVE-2026-43038 →CVE-2026-43125 →CVE-2026-43329 →

📋 Description

CVE-2026-43038 — kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() CVE-2026-43125 — kernel: dlm: validate length in dlm_search_rsb_tree CVE-2026-43329 — kernel: netfilter: flowtable: strictly check for maximum number of actions CVE-2026-64530 — kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle

🎯 Affected products36

  • Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-0:1-12.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-0:1-12.el8_8.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-0:1-12.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-debuginfo-0:1-12.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-debuginfo-0:1-12.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-debugsource-0:1-12.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_107_1-debugsource-0:1-12.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-0:1-11.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-0:1-11.el8_8.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-0:1-11.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-debuginfo-0:1-11.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-debuginfo-0:1-11.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-debugsource-0:1-11.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_120_1-debugsource-0:1-11.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-0:1-9.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-0:1-9.el8_8.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-0:1-9.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-debuginfo-0:1-9.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-debuginfo-0:1-9.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-debugsource-0:1-9.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_130_1-debugsource-0:1-9.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-0:1-5.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-0:1-5.el8_8.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-0:1-5.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-debuginfo-0:1-5.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-debuginfo-0:1-5.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-debugsource-0:1-5.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_143_1-debugsource-0:1-5.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kpatch-patch-4_18_0-477_97_1-0:1-16.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • +6 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 Workaround: To mitigate this issue, avoid configuring the Linux kernel's traffic control (tc) subsystem with the RED queue discipline (`red`) that includes `qevent early_drop` and an `action ct` filter on interfaces processing fragmented UDP streams. This specific configuration is required to trigger the use-after-free vulnerability.

🔗 References (7)