CVE-2024-40931

Name	CVE-2024-40931
Description	In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure snd_una is properly initialized on connect This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after fallback and before processing any other incoming packet - so that snd_una is still left uninitialized. Address the issue explicitly initializing snd_una together with snd_nxt and write_seq.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-5730-1, DSA-5731-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.218-1	vulnerable
	bullseye (security)	5.10.223-1	fixed
	bookworm	6.1.94-1	vulnerable
	bookworm (security)	6.1.99-1	fixed
	sid, trixie	6.10.6-1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	bullseye	5.10.221-1	DSA-5730-1
linux	source	bookworm	6.1.99-1	DSA-5731-1
linux	source	(unstable)	6.9.7-1

https://git.kernel.org/linus/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3 (6.10-rc4)