CVE-2022-39842

Name	CVE-2022-39842
Description	An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.
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-3131-1, DLA-3173-1, DSA-5257-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye (security), bullseye	5.10.223-1	fixed
	bookworm	6.1.106-3	fixed
	bookworm (security)	6.1.112-1	fixed
	trixie	6.10.11-1	fixed
	sid	6.10.12-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
linux	source	buster	4.19.260-1		DLA-3131-1
linux	source	bullseye	5.10.149-1		DSA-5257-1
linux	source	(unstable)	5.19.6-1	unimportant
linux-5.10	source	buster	5.10.149-2~deb10u1		DLA-3173-1

https://git.kernel.org/linus/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 (5.19-rc4)
Driver not enabled in Debian configs