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Description

acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.

PUBLISHED Reserved 2026-06-12 | Published 2026-06-29 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 7.2CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

Default status
affected

Any version before 2.4.0
affected

Credits

Andrew Tridgell finder

Andreas Gruenbacher finder

References

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

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

www.vulncheck.com/...ink-traversal-via-getfacl-setfacl-chacl third-party-advisory

cve.org (CVE-2026-54370)

nvd.nist.gov (CVE-2026-54370)

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