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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
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 CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted 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)
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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)
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          "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."
        }
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        },
        {
          "url": "https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"
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    "datePublished": "2026-07-25T08:51:37.405Z",
    "dateReserved": "2026-07-19T15:36:31.790Z",
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      "title": "vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc",
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            "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."
          }
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        "metrics": {},
        "published": "2026-07-25T10:17:32.863",
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      "cve": "CVE-2026-64474",
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      "source": "Red Hat CSAF VEX",
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      "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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