CVE-2026-64475

Vulnerability 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.

CVSS Score

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