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CVE-2025-38552

9.4 · CRITICAL

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 be…

Published Aug 16, 2025EPSS 0.33%

Overview

CVE-2025-38552 is a critical-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/659da22dee5ff316ba63bdaeeac7b58b5442f6c2Refgit.kernel.org/stable/c/7c96d519ee15a130842a6513530b4d20acd2bfcdRefgit.kernel.org/stable/c/c476d627584b7589a134a8b48dd5c6639e4401c5Refgit.kernel.org/stable/c/def5b7b2643ebba696fc60ddf675dca13f073486Refgit.kernel.org/stable/c/f81b6fbe13c7fc413b5158cdffc6a59391a2a8dbReflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-032379.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38552?

CVE-2025-38552 is a critical-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

How severe is CVE-2025-38552?

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-38552?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38552?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38552 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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