UBUNTU-CVE-2026-54370

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Source
https://ubuntu.com/security/CVE-2026-54370
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54370
Upstream
  • CVE-2026-54370
Published
2026-06-29T14:16:00Z
Modified
2026-07-01T21:27:56Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 7.2 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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(), aclgetfile(), and aclsetfile(). 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.

References

Affected packages

Ubuntu:14.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.52-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.2.52-1"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.2.52-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:16.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.52-2
2.2.52-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.2.52-3"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.2.52-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:18.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.52-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.2.52-3build1"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.2.52-3build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:20.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.53-4
2.2.53-5
2.2.53-5ubuntu1
2.2.53-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.2.53-6"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.2.53-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:22.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.53-10ubuntu2
2.3.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.3.1-1"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.3.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:24.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.1-3
2.3.1-4ubuntu1
2.3.2-1
2.3.2-1build1
2.3.2-1build1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.3.2-1build1.1"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.3.2-1build1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:25.10
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.2-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.3.2-2"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.3.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"
Ubuntu:26.04:LTS
acl

Package

Name
acl
Purl
pkg:deb/ubuntu/acl?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.2-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "acl",
            "binary_version": "2.3.2-2"
        },
        {
            "binary_name": "libacl1",
            "binary_version": "2.3.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54370.json"