authd Denial of Service and Local Privilege Escalation_CVE-2026-6970

7.3 / 10

HIGH

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

Description

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.

Basic Information

ID CVE-2026-6970

Source canonical

Published Apr 27, 2026 at 15:28

Modified Apr 27, 2026 at 16:17

Affected Product

Vendor Canonical

Product authd

Version 0.6.0

Affected Versions Canonical authd 0.6.0
Canonical authd 0.6.1

CWE Classification

CWE-842

References

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    "published": "2026-04-27T15:28:48.209Z",
    "modified": "2026-04-27T16:17:10.157Z",
    "type": "cve",
    "title": "authd Denial of Service and Local Privilege Escalation",
    "source": "canonical",
    "references": "https://github.com/canonical/authd/security/advisories/GHSA-fg3j-5w9g-hmg7\nhttps://github.com/canonical/authd/commit/154b428305cb1a7a19c897626fefd09d6dde8b9f",
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