VYPR
Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

mptcp: ensure snd_una is properly initialized on connect

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.

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Affected products

161

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