CVE-2024-40931

CVE-2024-40931: vulnerability in Linux

mptcp: ensure snd_una is properly initialized on connect

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.3%
exploitation probability
0.3%top 84% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6ddehttps://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7cehttps://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57fhttps://lists.debian.org/debian-lts-announce/2025/01/msg00001.html