RHSA-2026:42739HighCVSS 7.1

Red Hat Security Advisory: acl security update

Published
July 21, 2026
Last Modified
August 18, 2026

🔗 CVE IDs covered (2)

CVE-2026-54369 →CVE-2026-54370 →

📋 Description

CVE-2026-54369 — acl: Symlink traversal privilege escalation via libacl functions CVE-2026-54370 — acl: TOCTOU Symlink Traversal via getfacl/setfacl

🎯 Affected products39

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-0:2.4.0-1.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debuginfo-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • acl-debugsource-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-0:2.4.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-0:2.4.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-debuginfo-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • libacl-debuginfo-0:2.4.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • libacl-debuginfo-0:2.4.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • +9 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: Restrict unprivileged users from creating symlinks in directories that privileged processes operate on with ACL commands. Where possible, use the fs.protected_symlinks sysctl (enabled by default on RHEL 7+), which prevents symlink following in world-writable sticky directories unless the owner of the symlink matches the owner of the target file or directory.

🔗 References (5)