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CVE-2025-38546 – Linux ATM Clip VCC Memory Leak

The following table lists the changes that have been made to the
CVE-2025-38546 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

    Aug. 16, 2025

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

    atm: clip: Fix memory leak of struct clip_vcc.

    ioctl(ATMARP_MKIP) allocates struct clip_vcc and set it to
    vcc->user_back.

    The code assumes that vcc_destroy_socket() passes NULL skb
    to vcc->push() when the socket is close()d, and then clip_push()
    frees clip_vcc.

    However, ioctl(ATMARPD_CTRL) sets NULL to vcc->push() in
    atm_init_atmarp(), resulting in memory leak.

    Let’s serialise two ioctl() by lock_sock() and check vcc->push()
    in atm_init_atmarp() to prevent memleak.
    Added Reference https://git.kernel.org/stable/c/0c17ff462d98c997d707ee5cf4e4a9b1b52b9d90
    Added Reference https://git.kernel.org/stable/c/1c075e88d5859a2c6b43b27e0e46fb281cef8039
    Added Reference https://git.kernel.org/stable/c/1fb9fb5a4b5cec2d56e26525ef8c519de858fa60
    Added Reference https://git.kernel.org/stable/c/2fb37ab3226606cbfc9b2b6f9e301b0b735734c5
    Added Reference https://git.kernel.org/stable/c/62dba28275a9a3104d4e33595c7b3328d4032d8d
    Added Reference https://git.kernel.org/stable/c/9e4dbeee56f614e3f1e166e5d0655a999ea185ef
    Added Reference https://git.kernel.org/stable/c/9f771816f14da6d6157a8c30069091abf6b566fb
    Added Reference https://git.kernel.org/stable/c/cb2e4a2f8f268d8fba6662f663a2e57846f14a8d
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