RHSA-2026:99119HighCVSS 8.0

Red Hat Security Advisory: util-linux security update

Published
November 12, 2026
Last Modified
November 12, 2026

🔗 CVE IDs covered (3)

CVE-2026-13595 →CVE-2026-53613 →CVE-2026-53615 →

📋 Description

CVE-2026-13595 — util-linux: util-linux: heap use-after-free in libblkid nested partition probing CVE-2026-53613 — util-linux: TOCTOU in the mount program via ancestor directory swap on target path CVE-2026-53615 — util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-0:2.37.4-25.el9_8.2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-0:2.37.4-25.el9_8.2.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-0:2.37.4-25.el9_8.2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libblkid-debuginfo-0:2.37.4-25.el9_8.2.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8)
  • libblkid-devel-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-devel-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-devel-0:2.37.4-25.el9_8.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-devel-0:2.37.4-25.el9_8.2.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libblkid-devel-0:2.37.4-25.el9_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.8)
  • libfdisk-0:2.37.4-25.el9_8.2.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • libfdisk-0:2.37.4-25.el9_8.2.i686 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.8)
  • +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 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: Review /etc/fstab and remove the user or users mount option from any entry where unprivileged user mounting is not strictly required. This eliminates the prerequisite for exploitation. For entries that must retain user mount capability, ensure all ancestor directories in the mount target path are owned by root and not writable by unprivileged users (mode 0755 or stricter), preventing the renameat2(RENAME_EXCHANGE) directory swap needed to exploit the race. These changes take effect immediately with no reboot required. Workaround: Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available.

🔗 References (6)