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CVE-2025-21972

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: mctp: unshare packets when reassembling Ensure that the frag_list used for reassembly isn't shared with other packets.

Published Apr 1, 2025CWE-401EPSS 0.23%

Overview

CVE-2025-21972 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

net: mctp: unshare packets when reassembling

Ensure that the frag_list used for reassembly isn't shared with other

packets. This avoids incorrect reassembly when packets are cloned, and

prevents a memory leak due to circular references between fragments and

their skb_shared_info.

The upcoming MCTP-over-USB driver uses skb_clone which can trigger the

problem - other MCTP drivers don't share SKBs.

A kunit test is added to reproduce the issue.

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/5c47d5bfa7b096cf8890afac32141c578583f8e0Refgit.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6eRefgit.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21972?

CVE-2025-21972 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-21972?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21972?

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-2025-21972?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21972 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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