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CVE-2025-21676 – Linux Fec Network Driver Null Pointer Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21676 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

    Jan. 31, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    net: fec: handle page_pool_dev_alloc_pages error

    The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did
    not handle the case when it returned NULL. There was a WARN_ON(!new_page)
    but it would still proceed to use the NULL pointer and then crash.

    This case does seem somewhat rare but when the system is under memory
    pressure it can happen. One case where I can duplicate this with some
    frequency is when writing over a smbd share to a SATA HDD attached to an
    imx6q.

    Setting /proc/sys/vm/min_free_kbytes to higher values also seems to solve
    the problem for my test case. But it still seems wrong that the fec driver
    ignores the memory allocation error and can crash.

    This commit handles the allocation error by dropping the current packet.
    Added Reference https://git.kernel.org/stable/c/001ba0902046cb6c352494df610718c0763e77a5
    Added Reference https://git.kernel.org/stable/c/1425cb829556398f594658512d49292f988a2ab0
    Added Reference https://git.kernel.org/stable/c/8a0097db0544b658c159ac787319737712063a23
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