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().
Affected products
linux: linux kernel; debian: debian linux
References7
- git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894 Patch
- git.kernel.org/stable/c/676f03760ca1d69c2470cef36c44dc152494b47c Patch
- git.kernel.org/stable/c/969b06bd8b7560efb100a34227619e7d318fbe05 Patch
- git.kernel.org/stable/c/ee438c492b2e0705d819ac0e25d04fae758d8f8f Patch
- git.kernel.org/stable/c/faf332a10372390ce65d0b803888f4b25a388335 Patch
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
- cert-portal.siemens.com/productcert/html/ssa-032379.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 6 · as of 8 November 2026
- CWE
- CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.