CVE-2025-40158

Name	CVE-2025-40158
Description	In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_output() Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent possible UAF. We can remove rcu_read_lock()/rcu_read_unlock() pairs from ip6_finish_output2().
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-4850-1, DSA-6568-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bookworm	6.1.176-1	vulnerable
	bookworm (security)	6.1.190-1	vulnerable
	trixie	6.12.107-1	vulnerable
	trixie (security)	6.12.113-1	fixed
	forky	7.2.11-1	fixed
	sid	7.2.12-1	fixed
linux-6.12 (PTS)	bookworm (security)	6.12.113-1~deb12u1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	trixie	6.12.113-1	DSA-6568-1
linux	source	(unstable)	6.17.6-1
linux-6.12	source	bookworm	6.12.113-1~deb12u1	DLA-4850-1

https://git.kernel.org/linus/11709573cc4e48dc34c80fc7ab9ce5b159e29695 (6.18-rc1)