CVE-2021-3982

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)	bullseye (security), bullseye	3.38.6-1~deb11u2	fixed
	bookworm, bookworm (security)	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	(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