UBUNTU-CVE-2026-6970

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Source
https://ubuntu.com/security/CVE-2026-6970
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6970.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6970
Upstream
  • CVE-2026-6970
Downstream
Related
Published
2026-04-27T00:00:00Z
Modified
2026-05-26T19:29:39.259134120Z
Severity
  • 7.3 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

authd prior to version 0.6.4 contains a logic error in primary group ID assignment that can lead to local privilege escalation. When a user's primary group ID (GID) differs from their UID, either because the account was created with authd prior to version 0.5.4 or because the primary group was manually changed via the authctl group set-gid command, and the user's identity provider record is updated, authd incorrectly resets the user's primary group ID to their UID upon next login. This causes newly created files and directories to be owned by the wrong group, causing denial of service issues, and potentially granting unintended access to other local users and allowing local privilege escalation.

References

Affected packages

Ubuntu:26.04:LTS / authd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.6.1ubuntu0.1

Affected versions

0.*
0.5.11
0.6.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "authd",
            "binary_version": "0.6.1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6970.json"