DEBIAN-CVE-2026-54370
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.
DEBIAN-CVE-2026-54370
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-54370
acl
Source reference: /affected/0/package/name
- Affected versions
- 2.3.1-3
Source reference:
/affected/0/versions2.3.1-4Source reference:
/affected/0/versions2.3.1-5Source reference:
/affected/0/versions2.3.1-6Source reference:
/affected/0/versions2.3.2-1Source reference:
/affected/0/versions2.3.2-2Source reference:
/affected/0/versions2.3.2-3Source reference:
/affected/0/versions2.4.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
acl
Source reference: /affected/1/package/name
- Affected versions
- 2.3.2-2
Source reference:
/affected/1/versions2.3.2-3Source reference:
/affected/1/versions2.4.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
acl
Source reference: /affected/2/package/name
- Affected versions
- 2.3.2-2
Source reference:
/affected/2/versions2.3.2-3Source reference:
/affected/2/versions - Fixed versions
- 2.4.0-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "acl",
"purl": "pkg:deb/debian/acl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.3.1-3",
"2.3.1-4",
"2.3.1-5",
"2.3.1-6",
"2.3.2-1",
"2.3.2-2",
"2.3.2-3",
"2.4.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54370.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "acl",
"purl": "pkg:deb/debian/acl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.3.2-2",
"2.3.2-3",
"2.4.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54370.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.0-1"
}
]
}
],
"package": {
"name": "acl",
"purl": "pkg:deb/debian/acl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.3.2-2",
"2.3.2-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54370.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57870 · Revision 1
- Added to Heist Feed
- Publisher date