RHSA-2026:99722HighCVSS 8.8

Red Hat Security Advisory: kpatch-patch-6_12_0-211_16_1 and kpatch-patch-6_12_0-211_49_1 security update

Published
November 12, 2026
Last Modified
November 12, 2026

🔗 CVE IDs covered (4)

CVE-2026-31709 →CVE-2026-53361 →CVE-2026-74705 →CVE-2026-81000 →

📋 Description

CVE-2026-31709 — kernel: smb: client: validate the whole DACL before rewriting it in cifsacl CVE-2026-53361 — kernel: af_unix: Set gc_in_progress to true in unix_gc() CVE-2026-74705 — kernel: udp: fix potential use-after-free in tunnel segmentation CVE-2026-81000 — kernel: net: tun: bound receive headroom

🎯 Affected products13

  • Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-0:2-12.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:2-12.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-debuginfo-0:2-12.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_16_1-debugsource-0:2-12.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-0:2-4.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-debuginfo-0:2-4.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • kpatch-patch-6_12_0-211_49_1-debugsource-0:2-4.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)

✅ 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, if SMB client functionality is not required, the `cifs` kernel module can be blacklisted to prevent it from loading. This can be achieved by creating a modprobe configuration file. 1. Create a file named `/etc/modprobe.d/disable-cifs.conf` with the following content: ``` install cifs /bin/true blacklist cifs ``` 2. Regenerate the initramfs to ensure the change takes effect on boot: ```bash dracut -f -v ``` or for systems using `mkinitrd`: ```bash mkinitrd -f /boot/initramfs-$(uname -r).img $(uname -r) ``` 3. A system reboot is required for the changes to take effect. Warning: Disabling the `cifs` module will prevent the system from mounting SMB/CIFS shares. Ensure this functionality is not critical before applying this mitigation. refer: https://access.redhat.com/solutions/4117281 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: See the security bulletin for a detailed mitigation procedure.

🔗 References (7)