#VU127444 Incorrect User Management in authd - CVE-2024-9312
Published: October 10, 2024 / Updated: April 24, 2026
Vulnerability identifier: #VU127444
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2024-9312
CWE-ID: CWE-286
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
authd
authd
Software vendor:
Canonical Ltd.
Canonical Ltd.
Description
The vulnerability allows a local privileged user to gain another user's privileges.
The vulnerability exists due to incorrect user management in the GenerateID method and user ID assignment logic when registering user names. A local privileged user can register a user name that yields a colliding UID to gain another user's privileges.
Exploitation requires the ability to register user names, and the issue can be triggered because user ID uniqueness is checked only against a local cache that may be inconsistent, purged, or missing inactive users.
Remediation
Install security update from vendor's website.