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CVE-2026-64474 is a denial-of-service vulnerability in the Linux kernel VFIO migration state machine logic, specifically in vfio_mig_get_next_state(). The function advances through vfio_from_fsm_table[] one step at a time and skips optional migration states that a device does not support until it finds a supported next state. Blocked transitions are represented by the VFIO_DEVICE_STATE_ERROR sentinel and are intended to be rejected by returning -EINVAL. The vulnerable logic failed to terminate the skip loop when the next state became the ERROR sentinel. Because the state flags for ERROR evaluate as supported and the transition table maps ERROR back to itself, the loop condition remains satisfied indefinitely and the state never advances. On precopy-capable devices, blocked transitions such as STOP_COPY to PRE_COPY and STOP_COPY to PRE_COPY_P2P can therefore cause the function to spin forever while holding the driver state mutex.
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