CVE-2021-44731

Name	CVE-2021-44731
Description	A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-5080-1, ELA-745-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
snapd (PTS)	stretch (security)	2.21-2+deb9u1	vulnerable
	stretch (lts), stretch	2.21-2+deb9u3	fixed
	buster (security), buster, buster (lts)	2.37.4-1+deb10u3	fixed
	bullseye (security), bullseye	2.49-1+deb11u2	fixed
	bookworm	2.57.6-1	fixed
	trixie, sid	2.65.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
snapd	source	stretch	2.21-2+deb9u2	ELA-745-1
snapd	source	buster	2.37.4-1+deb10u1	DSA-5080-1
snapd	source	bullseye	2.49-1+deb11u1	DSA-5080-1
snapd	source	(unstable)	2.54.3-1

https://www.openwall.com/lists/oss-security/2022/02/17/2