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Description

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.

PUBLISHED Reserved 2026-06-12 | Published 2026-06-29 | Updated 2026-07-15 | Assigner VulnCheck




HIGH: 8.4CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

HIGH: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

Improper Link Resolution Before File Access ('Link Following')

Product status

Default status
affected

Any version before 2.4.0
affected

Credits

Andrew Tridgell finder

Andreas Gruenbacher remediation developer

References

access.redhat.com/security/cve/CVE-2026-54369 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2490277 (RHBZ#2490277) issue-tracking

security.access.redhat.com/...2/vex/2026/cve-2026-54369.json

access.redhat.com/errata/RHSA-2026:34351 vendor-advisory

cgit.git.savannah.nongnu.org/...b34bdd9265936e17190b6d3f17d1 patch

cgit.git.savannah.nongnu.org/...76612194f8a56c2314389adc74a5 issue-tracking

www.vulncheck.com/...ivilege-escalation-via-libacl-functions third-party-advisory

cve.org (CVE-2026-54369)

nvd.nist.gov (CVE-2026-54369)

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