RHSA-2026:27729CriticalCVSS 8.8

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

Published
June 22, 2026
Last Modified
August 21, 2026

🔗 CVE IDs covered (6)

CVE-2026-43037 →CVE-2026-43110 →CVE-2026-43158 →CVE-2026-43190 →CVE-2026-46243 →CVE-2026-23243 →

📋 Description

CVE-2026-23243 — kernel: Linux kernel: Denial of service and memory corruption in RDMA umad CVE-2026-43037 — kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() CVE-2026-43110 — kernel: wifi: brcmfmac: validate bsscfg indices in IF events CVE-2026-43158 — kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks CVE-2026-43190 — kernel: netfilter: xt_tcpmss: check remaining length before reading optlen CVE-2026-46243 — kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

🎯 Affected products95

  • Red Hat Enterprise Linux Server (v. 7 ELS)
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • bpftool-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-0:3.10.0-1160.153.1.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-0:3.10.0-1160.153.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • bpftool-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • kernel-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-0:3.10.0-1160.153.1.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-0:3.10.0-1160.153.1.el7.src as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-0:3.10.0-1160.153.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-abi-whitelists-0:3.10.0-1160.153.1.el7.noarch as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-bootwrapper-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-bootwrapper-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-0:3.10.0-1160.153.1.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-0:3.10.0-1160.153.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • +65 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: To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: Mitigation for this issue is to skip loading the affected module `ip6_tunnel` onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ We may also want to detection and monitoring an affected system as below: ~~~ Monitor for exploitation attempts: # Enable kernel audit for IPv6 tunnel operations auditctl -a always,exit -F arch=b64 -S socket -F a0=10 -F a1=3 -k ipv6_tunnel # Monitor system logs for kernel panics/crashes journalctl -k -p err -f | grep -i "ip6_tunnel\|icmp\|stack" ~~~ Workaround: To mitigate this issue, prevent module brcmfmac from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. 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: See the security bulletin for a detailed mitigation procedure.

🔗 References (9)