Description
A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gdm | prior to 3.38.2.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gdm3 | 3.38.2.1-1 | — |
| Debian 13 | gdm3 | 3.38.2.1-1 | — |
| Debian 12 | gdm3 | 3.38.2.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | gdm3 | No fix yet | — |
| Ubuntu 20.04 LTS | gdm3 | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gdm | 41.0-1.1 | openSUSE-SU-2024:11547-1 |
Advisories 1
- openSUSE-SU-2024:11547-1 gdm-41.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026