| Name | CVE-2021-3982 |
| Description | Linux distributions using CAP_SYS_NICE for gnome-shell may be exposed to a privilege escalation issue. An attacker, with low privilege permissions, may take advantage of the way CAP_SYS_NICE is currently implemented and eventually load code to increase its process scheduler priority leading to possible DoS of other services running in the same machine. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| gnome-shell (PTS) | jessie | 3.14.4-1~deb8u1 | vulnerable |
| stretch (security), stretch (lts), stretch | 3.22.3-3+deb9u1 | fixed |
| buster | 3.30.2-11~deb10u2 | fixed |
| bullseye (security), bullseye | 3.38.6-1~deb11u2 | fixed |
| bookworm (security), bookworm | 43.9-0+deb12u2 | fixed |
| sid, trixie | 47.1-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| gnome-shell | source | jessie | (unfixed) | end-of-life | | |
| gnome-shell | source | (unstable) | (not affected) | | | |
Notes
- gnome-shell <not-affected> (Debian packaging does not set cap_sys_nice+ep on gnome-shell binary)
https://bugzilla.redhat.com/show_bug.cgi?id=2024174
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4711
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2284