Vulnerability-Lookup

CVE-2026-64474 (GCVE-0-2026-64474)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

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

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8e872c07e40d51a66…
https://git.kernel.org/stable/c/ed7d5599e6c398da7…
https://git.kernel.org/stable/c/7f2d6b31089e48db4…
https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc2…
https://git.kernel.org/stable/c/a26b499b757cfc8bb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < 8e872c07e40d51a66dee7b280a23a460a2e1e3fa (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < ed7d5599e6c398da74845767cd1e6a8370a160fc (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < 7f2d6b31089e48db4653df832c9a6afdde9a1c29 (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < a3a8afa2f6e7f0dc266d08f02be3f3054241ba47 (git) Affected: 4db52602a6074e9cc523500b8304600ff63e7b85 , < a26b499b757cfc8bbff1088bb1b844639e250893 (git)
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-rc1 , ≤ * (original_commit_for_fix)

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        },
        {
          "url": "https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"
        }
      ],
      "title": "vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc",
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    "datePublished": "2026-07-25T08:51:37.405Z",
    "dateReserved": "2026-07-19T15:36:31.790Z",
    "dateUpdated": "2026-07-25T08:51:37.405Z",
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:39Z",
      "cve": "CVE-2026-64474",
      "id": "CVE-2026-64474",
      "initial_release_date": "2026-07-25T15:58:39Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64474",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64474.json",
      "version": "2"
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}

GHSA-67FJ-9V49-3CH9

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64474"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:32Z",
    "severity": null
  },
  "details": "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": "GHSA-67fj-9v49-3ch9",
  "modified": "2026-07-25T12:31:37Z",
  "published": "2026-07-25T12:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64474"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64474 (GCVE-0-2026-64474)

GHSA-67FJ-9V49-3CH9

Tags

Sightings

Nomenclature