CVE-2025-21972

Published: Apr 1, 2025

Modified: May 11, 2026

PUBLISHED

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.

Vendor	Product	Versions
Linux	Linux	affected `4a992bbd365094730a31bae1e12a6ca695336d57 - < 5c47d5bfa7b096cf8890afac32141c578583f8e0` affected `4a992bbd365094730a31bae1e12a6ca695336d57 - < f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e` affected `4a992bbd365094730a31bae1e12a6ca695336d57 - < f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc`
Linux	Linux	affected `5.15` unaffected `0 - < 5.15` unaffected `6.12.20 - <= 6.12.` unaffected `6.13.8 - <= 6.13.` unaffected `6.14 - <= *`

References

https://git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0

https://git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e

https://git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc

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CVE-2025-21972

Description

Affected Products

References