CVE-2025-38064
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, during system shutdown or kexec, virtio devices are not broken or reset. This can cause a hang, as devices (e.g., virtio-console) continue to write to MMIO after the PCI bus reset, and IOMMUs are reset before devices.
Risk Assessment
Failure to reset virtio devices during shutdown can cause system hangs during kexec or normal shutdown, and invalid guest memory operations, potentially leading to data loss or instability.
Recommendation
Apply the Linux kernel patch that breaks and resets all virtio devices during virtio bus shutdown (device_shutdown).
Other vulnerabilities in Linux kernel
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Original NVD description (English source)
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.