CVE-2026-54369
Publication date 29 June 2026
Last updated 25 August 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| acl | 26.04 LTS resolute | Ignored backport too intrusive |
| 24.04 LTS noble | Ignored backport too intrusive | |
| 22.04 LTS jammy | Ignored backport too intrusive | |
| 20.04 LTS focal | Ignored backport too intrusive | |
| 18.04 LTS bionic | Ignored backport too intrusive | |
| 16.04 LTS xenial | Ignored backport too intrusive | |
| 14.04 LTS trusty | Ignored backport too intrusive |
Notes
Severity score breakdown
CVSS version:
Base score
8.4 · High
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Base score
7.1 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-54369
- https://www.openwall.com/lists/oss-security/2026/06/29/1
- https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=24a227d0ab8576612194f8a56c2314389adc74a5
- https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=3589787cd589b34bdd9265936e17190b6d3f17d1
- https://www.vulncheck.com/advisories/acl-symlink-traversal-privilege-escalation-via-libacl-functions
- 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