In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211_hwsim: clamp virtio RX length before skb_put
hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() – a host-triggerable guest panic (denial of service).
Clamp the length to the skbs available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.
References
- https://git.kernel.org/stable/c/10a2b430f8f06ae14b9590b6f6faa6b588ef0654
- https://git.kernel.org/stable/c/6dc76371a9a360c29de00df5b11563102d9d675a
- https://git.kernel.org/stable/c/82c5a30a66e2a7337d99476c67d6fc1a99c4250e
- https://git.kernel.org/stable/c/99dc05c75acc3c8cde8d89c5371f4b569de5ac62
- https://git.kernel.org/stable/c/fade308845c89f784da8a6780c1e77258488f1b6