CVE-2026-64474

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc

vfio_mig_get_next_state() walks vfio_from_fsm_table[] one step at a time,

looping to skip optional states the device does not support until

*next_fsm is supported. A blocked transition is encoded as

VFIO_DEVICE_STATE_ERROR, which the trailing return reports as -EINVAL.

The skip loop does not account for the ERROR sentinel.

state_flags_table[ERROR] is ~0U and vfio_from_fsm_table[ERROR][*] is

ERROR, so once *next_fsm becomes ERROR the loop condition stays true and

*next_fsm never changes. The blocked arcs STOP_COPY -> PRE_COPY and

STOP_COPY -> PRE_COPY_P2P map to ERROR yet pass the support check on a

precopy-capable device, causing the loop to spin forever while holding

the driver state mutex. This can result in a soft lockup, and a panic

with softlockup_panic set.

Terminate the skip loop on the ERROR sentinel so a blocked transition

falls throug

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References