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CVE-2025-21972 – Linux Kernel MCTP Net Fragment Reassembly Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21972 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Apr. 01, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0
    Added Reference https://git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e
    Added Reference https://git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc
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