{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/pci/qat/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6465af0004dc1b067129a26ef44f19cdf13bbce6",
              "status": "affected",
              "version": "bb208810b1abf1c84870cfbe1cc9cf1a1d35c607",
              "versionType": "git"
            },
            {
              "lessThan": "d416dcefdbac90d96b22485fd93f28229ad9984b",
              "status": "affected",
              "version": "bb208810b1abf1c84870cfbe1cc9cf1a1d35c607",
              "versionType": "git"
            },
            {
              "lessThan": "b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281",
              "status": "affected",
              "version": "bb208810b1abf1c84870cfbe1cc9cf1a1d35c607",
              "versionType": "git"
            },
            {
              "lessThan": "4ec5e932e636896e97e4c6a8205b0ac76d52421a",
              "status": "affected",
              "version": "bb208810b1abf1c84870cfbe1cc9cf1a1d35c607",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/pci/qat/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.12.97",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/qat: fix f_pos race in qat_vf_resume_write()\n\nqat_vf_resume_write() checks filp-\u003ef_pos before taking migf-\u003elock, but\ncopies into the migration-state buffer after taking the lock and\nre-reading the shared file position.\n\nTwo concurrent writers could therefore pass the bounds check with the\nold offset, then have the second writer copy after the first advanced\nf_pos, writing past the end of the migration-state buffer.\n\nTake migf-\u003elock before doing the boundary checks."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local write() syscalls on a VFIO live-migration resume fd returned by VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE ioctl on an opened QAT VFIO PCI device; there is no network, adjacent-wireless, or physical-device attack path to this code.\nAC:L - An attacker with the migration fd controls both racing writers (e.g., concurrent threads or dup\u0027d fds sharing f_pos) and can repeatedly trigger the TOCTOU window near the buffer end until the overflow succeeds; no uncontrollable victim timing or memory layout is required.\nPR:L - Exploitation requires only local access to an assigned Intel QAT VFIO device migration fd (typical QEMU/cloud/HPC VFIO clients), not real root in the init namespace; capabilities like CAP_NET_ADMIN via user namespaces do not grant this path.\nUI:N - No victim interaction is required; the attacker drives VFIO migration state transitions and concurrent writes to the resume fd programmatically without any separate user or administrator action during exploitation.\nS:U - The flaw corrupts host kernel heap memory from a VFIO client context and does not by itself cross an IOMMU, VM-guest, or other distinct security authority boundary; impact remains host kernel compromise/DoS within the same authority.\nC:H - The race yields an attacker-controlled heap out-of-bounds write past the 4096-byte migration-state kmalloc buffer, which can corrupt adjacent kernel objects and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak.\nI:H - copy_from_user() writes attacker-controlled data beyond mig_dev-\u003estate, enabling heap corruption and potential arbitrary kernel write or code-execution primitives through grooming of adjacent kmalloc objects.\nA:H - Heap corruption from the out-of-bounds write can immediately panic or oops the kernel or destabilize the system even when full exploitation is not attempted, satisfying high availability impact for kernel memory corruption."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:40.501Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6465af0004dc1b067129a26ef44f19cdf13bbce6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d416dcefdbac90d96b22485fd93f28229ad9984b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ec5e932e636896e97e4c6a8205b0ac76d52421a"
        }
      ],
      "title": "vfio/qat: fix f_pos race in qat_vf_resume_write()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74306",
    "datePublished": "2026-08-15T05:58:07.313Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:45:40.501Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}