CVE-2026-54369

Summary

acl before version 2.4.0 contains a symlink traversal vulnerability in the libacl pathname-based functions acl_get_file(), acl_set_file(), acl_extended_file(), and acl_delete_def_file() that allows local attackers to escalate privileges by replacing any pathname component with a symbolic link. Attackers who control any component of a pathname processed by a privileged caller can redirect ACL read or write operations to arbitrary files or directories, enabling unauthorized manipulation of access control lists and local privilege escalation.

Affected Software

Weaknesses

• CWE-59: Improper Link Resolution Before File Access ('Link Following')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

acl: Symlink traversal privilege escalation via libacl functions

Additional References

• https://access.redhat.com/security/cve/CVE-2026-54369
• https://bugzilla.redhat.com/show_bug.cgi?id=2490277
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54369.json
• https://access.redhat.com/errata/RHSA-2026:34351

References

• https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=3589787cd589b34bdd9265936e17190b6d3f17d1
• https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=24a227d0ab8576612194f8a56c2314389adc74a5
• https://www.vulncheck.com/advisories/acl-symlink-traversal-privilege-escalation-via-libacl-functions

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