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

What is CVE-2026-46142?

CVE-2026-46142 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 May 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:

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).

Which versions are affected by CVE-2026-46142?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46142?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-46142 being exploited?

There is no known exploitation of CVE-2026-46142 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-88944, BELL-CVE-2026-46142, DEBIAN-CVE-2026-46142, GHSA-9m3h-rxwg-69rx, ROOT-OS-UBUNTU-2404-CVE-2026-46142, UBUNTU-CVE-2026-46142.