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CVE-2025-38552 – Linux Kernel MPTCP Subflow Creation Race Condition Vulnerability

The following table lists the changes that have been made to the
CVE-2025-38552 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 16, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2
    Added Reference https://git.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcd
    Added Reference https://git.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486
    Added Reference https://git.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8db
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