PT-2026-35449 · Canonical · Authd

Samikhan-De · Published 2026-04-27 · Updated 2026-04-27 · CVE-2026-6970

Mitre

CVSS v4.0

7.3

High

AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Fix

LPE

Weakness Enumeration

CWE-842

Related Identifiers

CVE-2026-6970

Affected Products

Authd

References · 4

• https://github.com/canonical/authd/commit/154b428305cb1a7a19c897626fefd09d6dde8b9f · Patch
• https://github.com/canonical/authd/security/advisories/GHSA-fg3j-5w9g-hmg7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6970 · Security Note
• https://twitter.com/CVEnew/status/2048852141092028867 · Twitter Post