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Vulnerabilities CVE-2025-21972

CVE-2025-21972

High
Open
TLP:CLEAR

net: mctp: unshare packets when reassembling

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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.

Details

CVSS Score
8.8
EPSS Score
0.22%

12.6th percentile

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
Apr 1, 2025
Last Modified
Aug 5, 2026
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