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.
Affected products
linux: linux kernel
References5
- git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0 Patch
- git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e Patch
- git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc Patch
- git.kernel.org/stable/c/3d0281d0713952e8dd14d6d47e3a9c345c28a3b7
- git.kernel.org/stable/c/771087069a27c35c0a9fd7cc74fe7725b189b96b
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 25 · as of 7 November 2026
- CWE
- CWE-401
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.