CVE-2024-40931

MediumCVSS 5.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-908

Affected software

VendorProductVersions
LinuxLinux>= 8fd738049ac3d67a937d36577763b47180aae1ad, < 208cd22ef5e57f82d38ec11c1a1703f9401d6dde; >= 8fd738049ac3d67a937d36577763b47180aae1ad, < 7b9c7fc8600b64a86e4b47b2d190bba380267726; >= 8fd738049ac3d67a937d36577763b47180aae1ad, < f03c46eabb3a67bd2993e237ab5517f00a5f1813; >= 8fd738049ac3d67a937d36577763b47180aae1ad, < f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f; >= 8fd738049ac3d67a937d36577763b47180aae1ad, < ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce; >= 8fd738049ac3d67a937d36577763b47180aae1ad, < 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3
LinuxLinux5.9

References

Timeline

Published
Jul 12, 2024
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2024-40931: Medium severity, CVSS 5.5 | Vulnix