CVE-2025-39718

Summary

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().

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products we track (2)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894Patch
• https://git.kernel.org/stable/c/676f03760ca1d69c2470cef36c44dc152494b47cPatch
• https://git.kernel.org/stable/c/969b06bd8b7560efb100a34227619e7d318fbe05Patch
• https://git.kernel.org/stable/c/ee438c492b2e0705d819ac0e25d04fae758d8f8fPatch
• https://git.kernel.org/stable/c/faf332a10372390ce65d0b803888f4b25a388335Patch
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlAdvisory
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html