USN-3737-1: GDM vulnerability

13 August 2018

gdm3 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS


GDM could be made to crash or run programs as the administrator.

Software Description

  • gdm3 - GNOME Display Manager


A use-after-free was discovered in GDM. A local user could exploit this to cause a denial of service, or potentially execute arbitrary code as the administrator.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
gdm3 - 3.28.2-0ubuntu1.4

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.