CVE-2021-20321

Name	CVE-2021-20321
Description	A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DLA-2843-1, DLA-2941-1, DSA-5096-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	buster	4.19.249-2	fixed
	buster (security)	4.19.269-1	fixed
	bullseye	5.10.158-2	fixed
	bullseye (security)	5.10.162-1	fixed
	bookworm	6.1.7-1	fixed
	sid	6.1.8-1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	stretch	4.9.290-1	DLA-2843-1
linux	source	buster	4.19.232-1	DSA-5096-1
linux	source	bullseye	5.10.84-1
linux	source	(unstable)	5.14.12-1
linux-4.19	source	stretch	4.19.232-1~deb9u1	DLA-2941-1

https://git.kernel.org/linus/a295aef603e109a47af355477326bd41151765b6 (5.15-rc5)