CVE-2021-42327

Name	CVE-2021-42327
Description	dp_link_settings_write in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c in the Linux kernel through 5.14.14 allows a heap-based buffer overflow by an attacker who can write a string to the AMD GPU display drivers debug filesystem. There are no checks on size within parse_write_buffer_into_params when it uses the size of copy_from_user to copy a userspace buffer into a 40-byte heap buffer.
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	(not affected)
linux	source	buster	(not affected)
linux	source	bullseye	5.10.84-1
linux	source	(unstable)	5.14.16-1

Notes

[buster] - linux <not-affected> (Vulnerability introduced later)
[stretch] - linux <not-affected> (Vulnerability introduced later)
https://lists.freedesktop.org/archives/amd-gfx/2021-October/070170.html