RHSA-2026:55618HighCVSS 7.8

Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 security update

Published
August 17, 2026
Last Modified
August 31, 2026

🔗 CVE IDs covered (5)

CVE-2026-31641 →CVE-2026-43038 →CVE-2026-43329 →CVE-2026-46244 →CVE-2026-64530 →

📋 Description

CVE-2026-31641 — kernel: rxrpc: Fix RxGK token loading to check bounds CVE-2026-43038 — kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() CVE-2026-43329 — kernel: netfilter: flowtable: strictly check for maximum number of actions CVE-2026-46244 — kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync CVE-2026-64530 — kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle

🎯 Affected products7

  • Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-0:1-6.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:1-6.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kpatch-patch-6_12_0-211_16_1-debugsource-0:1-6.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)

✅ 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: The rxrpc kernel module can be prevented from loading to mitigate this issue. This action may impact applications that rely on the rxrpc protocol. To blacklist the rxrpc module: 1. Create a file `/etc/modprobe.d/blacklist-rxrpc.conf` with the following content: ``` blacklist rxrpc install rxrpc /bin/true ``` 2. Regenerate the initramfs: ```bash dracut -f -v ``` 3. Reboot the system for the changes to take effect. 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: 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 (8)