CVE-2026-90142 virtio_net: Fix resize of the RX ring
A memory corruption vulnerability in the Linux kernel's virtio_net driver allows attackers to write past buffer boundaries when resizing RX rings with AF_XDP sockets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90142?
CVE-2026-90142 is a high-severity memory corruption vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
virtio_net: Fix resize of the RX ring
When a AF_XDP socket is attached, the virtnet_rx_resize should resize the rq->xsk_buffs XSK buffer array. Otherwise, when the size grows, the virtnet_rx_resume() causes a write past the end of the array. This is easily reproducable with
ethtool -G ens3 rx 32 ./xdpsock -i eth0 -q 0 -r -z & ethtool -G eth0 rx 256
Which versions are affected by CVE-2026-90142?
How do I fix CVE-2026-90142?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90142 being exploited?
There is no known exploitation of CVE-2026-90142 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90142, DEBIAN-CVE-2026-90142, GHSA-2rwj-7pmr-4q35, UBUNTU-CVE-2026-90142.