Description
daemon/Greeter.cpp in sddm before 0.13.0 does not properly disable the KDE crash handler, which allows local users to gain privileges by crashing a greeter when using certain themes, as demonstrated by the plasma-workspace breeze theme.
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 | sddm | 0.12.0-5 | — |
| Debian 13 | sddm | 0.12.0-5 | — |
| Debian 12 | sddm | 0.12.0-5 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | sddm | 0.14.0-2.1 | openSUSE-SU-2024:10135-1 |
Advisories 1
- openSUSE-SU-2024:10135-1 sddm-0.14.0-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026