CVE-2025-21648

Name	CVE-2025-21648
Description	In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. See: 0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls") Note: hashtable resize is only possible from init_netns.
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-4075-1, 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)	bullseye	5.10.223-1	vulnerable
	bullseye (security)	5.10.234-1	fixed
	bookworm	6.1.129-1	fixed
	bookworm (security)	6.1.128-1	fixed
	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	bullseye	5.10.234-1	DLA-4075-1
linux	source	bookworm	6.1.128-1	DSA-5860-1
linux	source	(unstable)	6.12.10-1
linux-6.1	source	bullseye	6.1.128-1~deb11u1	DLA-4076-1

https://git.kernel.org/linus/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13 (6.13-rc7)