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Critical severity9.4NVD Advisory· Published Aug 16, 2025· Updated Jul 30, 2026

CVE-2025-38552

CVE-2025-38552

Description

In the Linux kernel, the following vulnerability has been resolved:

mptcp: plug races between subflow fail and subflow creation

We have races similar to the one addressed by the previous patch between subflow failing and additional subflow creation. They are just harder to trigger.

The solution is similar. Use a separate flag to track the condition 'socket state prevent any additional subflow creation' protected by the fallback lock.

The socket fallback makes such flag true, and also receiving or sending an MP_FAIL option.

The field 'allow_infinite_fallback' is now always touched under the relevant lock, we can drop the ONCE annotation on write.

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Affected products

121

Patches

Vulnerability mechanics

References

7

News mentions

1