CVE-2021-31916

Name	CVE-2021-31916
Description	An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module in the Linux kernel before 5.12. A bound check failure allows an attacker with special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2689-1, DLA-2690-1, ELA-458-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	jessie, jessie (lts)	3.16.84-1	vulnerable
	stretch (security)	4.9.320-2	fixed
	stretch (lts), stretch	4.9.320-3	fixed
	buster	4.19.249-2	fixed
	buster (security)	4.19.304-1	fixed
	bullseye	5.10.209-2	fixed
	bullseye (security)	5.10.205-2	fixed
	bookworm	6.1.76-1	fixed
	bookworm (security)	6.1.85-1	fixed
	trixie	6.6.15-2	fixed
	sid	6.7.9-2	fixed
linux-4.19 (PTS)	stretch (security)	4.19.232-1~deb9u1	fixed
	stretch (lts), stretch	4.19.304-1~deb9u1	fixed
linux-4.9 (PTS)	jessie, jessie (lts)	4.9.303-1~deb8u3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
linux	source	jessie	(unfixed)	end-of-life
linux	source	stretch	4.9.272-1		DLA-2689-1
linux	source	buster	4.19.194-1
linux	source	(unstable)	5.10.28-1
linux-4.19	source	stretch	4.19.194-1~deb9u1		DLA-2690-1
linux-4.9	source	jessie	4.9.272-1~deb8u2		ELA-458-1

https://git.kernel.org/linus/4edbe1d7bcffcd6269f3b5eb63f710393ff2ec7a
https://www.openwall.com/lists/oss-security/2021/03/28/1