CVE-2025-21671

Name	CVE-2025-21671
Description	In the Linux kernel, the following vulnerability has been resolved: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL. Which will potentially cause zram_meta_free to access the table if user reset an failed and uninitialized device.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4076-1, DSA-5860-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bookworm	6.1.176-1	fixed
	bookworm (security)	6.1.187-1	fixed
	trixie (security), trixie	6.12.107-1	fixed
	forky	7.1.13-1	fixed
	sid	7.2.6-1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	bullseye	(not affected)
linux	source	bookworm	6.1.128-1	DSA-5860-1
linux	source	(unstable)	6.12.11-1
linux-6.1	source	bullseye	6.1.128-1~deb11u1	DLA-4076-1

[bullseye] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/212fe1c0df4a150fb6298db2cfff267ceaba5402 (6.13)