CVE-2026-64474 (GCVE-0-2026-64474)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
EPSS
VEX
Title
vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4db52602a6074e9cc523500b8304600ff63e7b85 , < 8e872c07e40d51a66dee7b280a23a460a2e1e3fa
(git)
Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < ed7d5599e6c398da74845767cd1e6a8370a160fc (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < 7f2d6b31089e48db4653df832c9a6afdde9a1c29 (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < a3a8afa2f6e7f0dc266d08f02be3f3054241ba47 (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < a26b499b757cfc8bbff1088bb1b844639e250893 (git) |
guessed | |
| Linux | Linux |
Affected:
6.2
Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/vfio/vfio_main.c"
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"vendor": "Linux",
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"versionType": "git"
},
{
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{
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"versionType": "git"
}
]
},
{
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "6.2"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.96",
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{
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{
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"vulnerable": true
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{
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}
],
"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc\n\nvfio_mig_get_next_state() walks vfio_from_fsm_table[] one step at a time,\nlooping to skip optional states the device does not support until\n*next_fsm is supported. A blocked transition is encoded as\nVFIO_DEVICE_STATE_ERROR, which the trailing return reports as -EINVAL.\n\nThe skip loop does not account for the ERROR sentinel.\nstate_flags_table[ERROR] is ~0U and vfio_from_fsm_table[ERROR][*] is\nERROR, so once *next_fsm becomes ERROR the loop condition stays true and\n*next_fsm never changes. The blocked arcs STOP_COPY -\u003e PRE_COPY and\nSTOP_COPY -\u003e PRE_COPY_P2P map to ERROR yet pass the support check on a\nprecopy-capable device, causing the loop to spin forever while holding\nthe driver state mutex. This can result in a soft lockup, and a panic\nwith softlockup_panic set.\n\nTerminate the skip loop on the ERROR sentinel so a blocked transition\nfalls through to the existing return and reports -EINVAL."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:56:20.392Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa"
},
{
"url": "https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc"
},
{
"url": "https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29"
},
{
"url": "https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47"
},
{
"url": "https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"
}
],
"title": "vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-64474",
"datePublished": "2026-07-25T08:51:37.405Z",
"dateReserved": "2026-07-19T15:36:31.790Z",
"dateUpdated": "2026-08-17T04:56:20.392Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64474",
"date": "2026-11-01",
"epss": "0.00176",
"percentile": "0.07098"
},
"microsoft_vex": {
"current_release_date": "2026-07-27T14:48:31.000Z",
"cve": "CVE-2026-64474",
"id": "msrc_CVE-2026-64474",
"initial_release_date": "2026-07-26T01:06:19.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64474.json",
"version": "2"
},
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{
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"product": "Linux",
"programFiles": [
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],
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"product": "Linux",
"programFiles": [
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"vendor": "Linux",
"versions": [
{
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{
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"versionType": "semver"
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{
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"version": "6.6.145",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
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},
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc\n\nvfio_mig_get_next_state() walks vfio_from_fsm_table[] one step at a time,\nlooping to skip optional states the device does not support until\n*next_fsm is supported. A blocked transition is encoded as\nVFIO_DEVICE_STATE_ERROR, which the trailing return reports as -EINVAL.\n\nThe skip loop does not account for the ERROR sentinel.\nstate_flags_table[ERROR] is ~0U and vfio_from_fsm_table[ERROR][*] is\nERROR, so once *next_fsm becomes ERROR the loop condition stays true and\n*next_fsm never changes. The blocked arcs STOP_COPY -\u003e PRE_COPY and\nSTOP_COPY -\u003e PRE_COPY_P2P map to ERROR yet pass the support check on a\nprecopy-capable device, causing the loop to spin forever while holding\nthe driver state mutex. This can result in a soft lockup, and a panic\nwith softlockup_panic set.\n\nTerminate the skip loop on the ERROR sentinel so a blocked transition\nfalls through to the existing return and reports -EINVAL."
}
],
"id": "CVE-2026-64474",
"lastModified": "2026-08-17T05:17:53.030",
"metrics": {},
"published": "2026-07-25T10:17:32.863",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29"
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{
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"url": "https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-29T07:22:10+00:00",
"cve": "CVE-2026-64474",
"id": "CVE-2026-64474",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64474.json",
"version": "3"
}
}
}
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