Affected: The Gnome Projectr gdm

A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled in configuration, an attacker could bypass the lock screen by selecting the timed login user and waiting for the timer to expire, at which time they would gain access to the logged-in user's session.

Affected: Ubuntu:18.04:LTS: gdm3

Burghard Britzke discovered that GDM incorrectly handled certain configurations. An attacker could possibly use this issue to get unauthorized access to a different user.