CVE-2026-6970

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.

The following products are affected by CVE-2026-6970 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-6970.

URL	Resource
https://github.com/canonical/authd/commit/154b428305cb1a7a19c897626fefd09d6dde8b9f
https://github.com/canonical/authd/security/advisories/GHSA-fg3j-5w9g-hmg7