RHSA-2026:27288HighCVSS 7.8

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

Published
June 20, 2026
Last Modified
September 17, 2026

🔗 CVE IDs covered (15)

CVE-2026-46331 →CVE-2026-31772 →CVE-2026-43330 →CVE-2026-46125 →CVE-2026-46166 →CVE-2026-31641 →CVE-2026-31787 →CVE-2026-43260 →CVE-2026-31669 →CVE-2026-43056 →CVE-2026-46056 →CVE-2026-31474 →CVE-2026-31786 →CVE-2026-46152 →CVE-2026-46173 →

📋 Description

CVE-2026-31474 — kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() CVE-2026-31641 — kernel: rxrpc: Fix RxGK token loading to check bounds CVE-2026-31669 — kernel: mptcp: fix slab-use-after-free in __inet_lookup_established CVE-2026-31772 — kernel: Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync 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-2026-43056 — kernel: net: mana: fix use-after-free in add_adev() error path CVE-2026-43260 — kernel: bnxt_en: Fix RSS context delete logic CVE-2026-43330 — kernel: crypto: caam - fix overflow on long hmac keys 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 CVE-2026-46166 — kernel: wifi: mac80211: use safe list iteration in radar detect work 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 (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • Red Hat Enterprise Linux Real Time (v. 10)
  • Red Hat Enterprise Linux Real Time for NFV (v. 10)
  • kernel-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.26.1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.26.1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.26.1.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.26.1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-core-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-core-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-debug-devel-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-devel-matched-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-modules-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-core-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-extra-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-devel-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-devel-matched-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-modules-0:6.12.0-211.26.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • +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: Systems which do not require it can blocklist the `can_isotp` module to prevent it from being loaded. See https://access.redhat.com/solutions/41278 for more information. 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 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, 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. Workaround: To mitigate this vulnerability, prevent the 'act_pedit' kernel module from loading. Create a file `/etc/modprobe.d/disable-act_pedit.conf` with the following content: `install act_pedit /bin/true` Then, regenerate the initramfs and reboot the system for the changes to take effect. This may impact network traffic control functionality that relies on the pedit action.

🔗 References (18)