CVE-2026-54370 Details
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.
A time-of-check to time-of-use (TOCTOU) race condition vulnerability has been identified in acl versions prior to 2.4.0. This vulnerability allows local attackers to escalate privileges by manipulating pathname components with symbolic links. The issue arises between an lstat() check and subsequent operations that follow symbolic links, such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers can redirect file access control list (ACL) operations to arbitrary files when privileged processes invoke commands like getfacl, setfacl, or chacl' over an attacker-controlled path, leading to unauthorized manipulation of access control lists and local privilege escalation.
Users can upgrade to acl version 2.4.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 29, 2026CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| acl project acl | < 2.4.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 29, 2026 | New CVE Received | [email protected] |