CVE-2026-54369
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.
CSIRTS triage
- What
- Symlink Traversal Privilege Escalation via libacl Functions affects acl versions below 2.4.0.
- Who is affected
- Deployments using acl versions less than 2.4.0 are affected.
- Urgency
- Remediation is urgent due to the high severity with a CVSS score of 7.1.
- Action
- Upgrade acl to version 2.4.0 or later.
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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