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CVE-2025-39718 – vsock/virtio: Validate length in packet header before skb_put()

The following table lists the changes that have been made to the
CVE-2025-39718 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

    Sep. 05, 2025

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

    vsock/virtio: Validate length in packet header before skb_put()

    When receiving a vsock packet in the guest, only the virtqueue buffer
    size is validated prior to virtio_vsock_skb_rx_put(). Unfortunately,
    virtio_vsock_skb_rx_put() uses the length from the packet header as the
    length argument to skb_put(), potentially resulting in SKB overflow if
    the host has gone wonky.

    Validate the length as advertised by the packet header before calling
    virtio_vsock_skb_rx_put().
    Added Reference https://git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894
    Added Reference https://git.kernel.org/stable/c/676f03760ca1d69c2470cef36c44dc152494b47c
    Added Reference https://git.kernel.org/stable/c/969b06bd8b7560efb100a34227619e7d318fbe05
    Added Reference https://git.kernel.org/stable/c/ee438c492b2e0705d819ac0e25d04fae758d8f8f
    Added Reference https://git.kernel.org/stable/c/faf332a10372390ce65d0b803888f4b25a388335
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