RHSA-2026:26428HighCVSS 7.8

Red Hat Security Advisory: kernel-rt security update

Published
June 16, 2026
Last Modified
September 17, 2026

🔗 CVE IDs covered (8)

CVE-2026-46125 →CVE-2026-46152 →CVE-2026-31669 →CVE-2026-31786 →CVE-2026-31787 →CVE-2026-43110 →CVE-2026-43329 →CVE-2026-46056 →

📋 Description

CVE-2026-31669 — kernel: mptcp: fix slab-use-after-free in __inet_lookup_established CVE-2026-31786 — kernel: Buffer overflow in drivers/xen/sys-hypervisor.c CVE-2026-31787 — kernel: xen/privcmd: fix double free via VMA splitting CVE-2026-43110 — kernel: wifi: brcmfmac: validate bsscfg indices in IF events CVE-2026-43329 — kernel: netfilter: flowtable: strictly check for maximum number of actions CVE-2026-46056 — kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers CVE-2026-46125 — kernel: wifi: mac80211: remove station if connection prep fails CVE-2026-46152 — kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result

🎯 Affected products32

  • Red Hat Enterprise Linux NFV (v. 8)
  • Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-0:4.18.0-553.134.1.rt7.475.el8_10.src as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-0:4.18.0-553.134.1.rt7.475.el8_10.src as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-core-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-core-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-core-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-core-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-kvm-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-devel-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-devel-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-kvm-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-553.134.1.rt7.475.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • +2 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: 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, prevent the `privcmd` kernel module from loading if Xen virtualization is not actively used on the system. This can be achieved by blacklisting the module. Create a file named `/etc/modprobe.d/blacklist-privcmd.conf` with the following content: `blacklist privcmd` After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. `dracut -f -v` (for RHEL 7/8/9) or `mkinitrd -f -v` (for older RHEL versions) `reboot` This mitigation will prevent the `privcmd` module from being loaded at boot, thereby eliminating the vulnerability. However, systems requiring Xen virtualization will lose `privcmd` functionality. 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: To mitigate this issue, disable the Wi-Fi interface if wireless networking is not required. This can be achieved by preventing the `mac80211` kernel module from loading. To blacklist the `mac80211` module: `echo "blacklist mac80211" | sudo tee /etc/modprobe.d/blacklist-mac80211.conf`. After modifying the blacklist, regenerate the initramfs and reboot the system for the changes to take effect: `sudo dracut -f -v` and `sudo reboot`. Disabling the `mac80211` module will prevent Wi-Fi functionality on the system.

🔗 References (11)