Description
A flaw was discovered in gdm 3.24.1 where gdm greeter was no longer setting the ran_once boolean during autologin. If autologin was enabled for a victim, an attacker could simply select 'login as another user' to unlock their screen.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNOME | gdm | 3.24.1 | — |
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 | 3.26.0-1 | — |
| Debian 13 | gdm3 | 3.26.0-1 | — |
| Debian 12 | gdm3 | 3.26.0-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gdm | 3.38.2-2.7 | openSUSE-SU-2024:10780-1 |
Advisories 1
- openSUSE-SU-2024:10780-1 gdm-3.38.2-2.7 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026