CVE-2024-40931

mptcp: ensure snd_una is properly initialized on connect

State: Published
Severity: Not scored
Published: Jul 12, 2024
Updated: May 11, 2026
Reserved: Jul 12, 2024

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8fd738049ac3d67a937d36577763b47180aae1ad to before 208cd22ef5e57f82d38ec11c1a1703f9401d6ddeAffected 8fd738049ac3d67a937d36577763b47180aae1ad to before 7b9c7fc8600b64a86e4b47b2d190bba380267726Affected 8fd738049ac3d67a937d36577763b47180aae1ad to before f03c46eabb3a67bd2993e237ab5517f00a5f1813Affected 8fd738049ac3d67a937d36577763b47180aae1ad to before f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57fAffected 8fd738049ac3d67a937d36577763b47180aae1ad to before ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ceAffected 8fd738049ac3d67a937d36577763b47180aae1ad to before 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3Affected
LinuxLinux	5.9Affected before 5.9Not affected 5.10.221 through 5.10.Not affected 5.15.162 through 5.15.Not affected 6.1.95 through 6.1.Not affected 6.6.35 through 6.6.Not affected 6.9.6 through 6.9.*Not affected 6.10 and laterNot affected

Product

Versions

LinuxLinux

8fd738049ac3d67a937d36577763b47180aae1ad to before 208cd22ef5e57f82d38ec11c1a1703f9401d6ddeAffected
8fd738049ac3d67a937d36577763b47180aae1ad to before 7b9c7fc8600b64a86e4b47b2d190bba380267726Affected
8fd738049ac3d67a937d36577763b47180aae1ad to before f03c46eabb3a67bd2993e237ab5517f00a5f1813Affected
8fd738049ac3d67a937d36577763b47180aae1ad to before f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57fAffected
8fd738049ac3d67a937d36577763b47180aae1ad to before ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ceAffected
8fd738049ac3d67a937d36577763b47180aae1ad to before 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3Affected

LinuxLinux

5.9Affected
before 5.9Not affected
5.10.221 through 5.10.*Not affected
5.15.162 through 5.15.*Not affected
6.1.95 through 6.1.*Not affected
6.6.35 through 6.6.*Not affected
6.9.6 through 6.9.*Not affected
6.10 and laterNot affected

References

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