What is the severity of CVE-2025-21972?

CVE-2025-21972 has been classified as high severity due to the potential for incorrect packet reassembly and memory leaks.

How do I fix CVE-2025-21972?

To fix CVE-2025-21972, update to the latest version of the Linux Kernel where the vulnerability has been resolved.

Which versions of the Linux Kernel are affected by CVE-2025-21972?

CVE-2025-21972 affects multiple versions of the Linux Kernel prior to the patch that resolves the vulnerability.

What is the impact of CVE-2025-21972 on Linux systems?

The impact of CVE-2025-21972 includes the risk of data corruption due to improper packet reassembly and potential denial of service through memory leakage.

Is CVE-2025-21972 a network security vulnerability?

Yes, CVE-2025-21972 is a network security vulnerability related to packet handling in the Linux kernel.

Vulnerability/
CVE-2025-21972

1/4/2025

CVE-2025-21972: net: mctp: unshare packets when reassembling

First published: Tue Apr 01 2025(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected Software	Affected Version	How to fix
Linux Kernel

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2025-21972?
CVE-2025-21972 has been classified as high severity due to the potential for incorrect packet reassembly and memory leaks.
How do I fix CVE-2025-21972?
To fix CVE-2025-21972, update to the latest version of the Linux Kernel where the vulnerability has been resolved.
Which versions of the Linux Kernel are affected by CVE-2025-21972?
CVE-2025-21972 affects multiple versions of the Linux Kernel prior to the patch that resolves the vulnerability.
What is the impact of CVE-2025-21972 on Linux systems?
The impact of CVE-2025-21972 includes the risk of data corruption due to improper packet reassembly and potential denial of service through memory leakage.
Is CVE-2025-21972 a network security vulnerability?
Yes, CVE-2025-21972 is a network security vulnerability related to packet handling in the Linux kernel.

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