CVE-2025-38064 Information

Jun 19, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

virtio: break and reset virtio devices on device_shutdown()

Hongyu reported a hang on kexec in a VM. QEMU reported invalid memory accesses during the hang.

Invalid read at addr 0x102877002 size 2 region '(null)' reason: rejected
Invalid write at addr 0x102877A44 size 2 region '(null)' reason: rejected
...

It was traced down to virtio-console. Kexec works fine if virtio-console is not in use.

The issue is that virtio-console continues to write to the MMIO even after underlying virtio-pci device is reset.

Additionally Eric noticed that IOMMUs are reset before devices if devices are not reset on shutdown they continue to poke at guest memory and get errors from the IOMMU. Some devices get wedged then.

The problem can be solved by breaking all virtio devices on virtio bus shutdown then resetting them.

Reference

https://git.kernel.org/stable/c/8bd2fa086a04886798b505f28db4002525895203 https://git.kernel.org/stable/c/aee42f3d57bfa37b2716df4584edeecf63b9df4c

CNNVD-202506-2198 (Published: 2025-06-18)

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