CVE-2021-22555

Name	CVE-2021-22555
Description	A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	buster, buster (security)	4.19.249-2	fixed
	bullseye	5.10.140-1	fixed
	bullseye (security)	5.10.136-1	fixed
	bookworm	5.19.6-1	fixed
	sid	5.19.11-1	fixed

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

Package	Type	Release	Fixed Version
linux	source	stretch	4.9.272-1
linux	source	buster	4.19.194-1
linux	source	(unstable)	5.10.38-1

Notes

https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528
https://google.github.io/security-research/pocs/linux/cve-2021-22555/writeup.html