What’s Vulnerable › Vulnerabilities

CVE-2026-64475: vfio/pci: Release the VGA arbiter client on register_device() failure

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Release the VGA arbiter client on register_device() failure The re-order in the Fixes commit below displaced vfio_pci_vga_init() as the last failure point of what is now vfio_pci_core_register_device() without introducing an unwind for the VGA arbiter registration. In current kernels this is mostly benign because vfio_pci_set_decode() only uses pci_dev state, but the original failure path could leave a callback with a freed vdev cookie. The stale registration also becomes unsafe again once the callback follows drvdata to the vfio device. Add the required VGA unwind callout.

Affected products

• Linux kernel: from 5.10.37 before 5.10.261; from 5.11.21 before 5.12; from 5.12.4 before 5.13; 5.13 — fixed in 5.10.261, 5.12, 5.13, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.261, 5.12, 5.13, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f2a35a0c7ea7da347b814750eaa78adf3582381
• https://git.kernel.org/stable/c/278a5659c391fe5afe5f9ce1bad1fd24e90144f1
• https://git.kernel.org/stable/c/42d758a09d2c46c42357ecde9a5492f015bde2e5
• https://git.kernel.org/stable/c/52adb2dff7ce3d8430e2bdc5988b618a430def85
• https://git.kernel.org/stable/c/8d65decde9afd2bd78bcfffdc0df73b82a0b5509
• https://git.kernel.org/stable/c/9e0a3f642e607848669235f5069f35640abbfc88
• https://git.kernel.org/stable/c/daedde7f024ecf88bc8e832ed40cf2c795f0796a
• https://git.kernel.org/stable/c/ef4c38d30b3744e89eb5048218904bb629ea8d47

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