vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc
Summary
| CVE | CVE-2026-64474 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-25 10:17:32 UTC |
| Updated | 2026-07-25 10:17:32 UTC |
| 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 through to the existing return and reports -EINVAL. |
Risk And Classification
EPSS: 0.002090000 probability, percentile 0.111770000 (date 2026-07-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4db52602a6074e9cc523500b8304600ff63e7b85 8e872c07e40d51a66dee7b280a23a460a2e1e3fa git | Not specified |
| CNA | Linux | Linux | affected 4db52602a6074e9cc523500b8304600ff63e7b85 ed7d5599e6c398da74845767cd1e6a8370a160fc git | Not specified |
| CNA | Linux | Linux | affected 4db52602a6074e9cc523500b8304600ff63e7b85 7f2d6b31089e48db4653df832c9a6afdde9a1c29 git | Not specified |
| CNA | Linux | Linux | affected 4db52602a6074e9cc523500b8304600ff63e7b85 a3a8afa2f6e7f0dc266d08f02be3f3054241ba47 git | Not specified |
| CNA | Linux | Linux | affected 4db52602a6074e9cc523500b8304600ff63e7b85 a26b499b757cfc8bbff1088bb1b844639e250893 git | Not specified |
| CNA | Linux | Linux | affected 6.2 | Not specified |
| CNA | Linux | Linux | unaffected 6.2 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.96 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.39 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.4 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.