CVE-2025-21736

Name	CVE-2025-21736
Description	In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix possible int overflows in nilfs_fiemap() Since nilfs_bmap_lookup_contig() in nilfs_fiemap() calculates its result by being prepared to go through potentially maxblocks == INT_MAX blocks, the value in n may experience an overflow caused by left shift of blkbits. While it is extremely unlikely to occur, play it safe and cast right hand expression to wider type to mitigate the issue. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.
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-4102-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	vulnerable
	bullseye (security)	5.10.234-1	vulnerable
	bookworm	6.1.129-1	fixed
	bookworm (security)	6.1.128-1	vulnerable
	trixie	6.12.20-1	fixed
	sid	6.12.21-1	fixed
linux-6.1 (PTS)	bullseye (security)	6.1.129-1~deb11u1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	bookworm	6.1.129-1
linux	source	(unstable)	6.12.15-1
linux-6.1	source	bullseye	6.1.129-1~deb11u1	DLA-4102-1

https://git.kernel.org/linus/6438ef381c183444f7f9d1de18f22661cba1e946 (6.14-rc1)