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vhost/vdpa: validate virtqueue index in mmap and fault paths

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: vhost/vdpa: validate virtqueue index in mmap and fault paths vhost_vdpa_mmap() and vhost_vdpa_fault() use vma->vm_pgoff as a virtqueue index for get_vq_notification(), but they do not validate that the index is smaller than v->nvqs. The ioctl path already performs both a bounds check and array_index_nospec(), but the mmap/fault path only checks that the index fits in u16. This allows an out-of-range queue index to reach driver-specific get_vq_notification() callbacks. Fix this by extracting a unified vhost_vdpa_get_vq_notification() helper that validates the queue index against v->nvqs and applies array_index_nospec() before calling the driver callback. Both the mmap and fault paths use this helper, and the bounds checking is consolidated into a single location. From source inspection, the most defensible impact is out-of-bounds access in the callback path, potentially leading to invalid PFN remaps and crash/DoS.

Announced Source revision 1
Original source ↗

CVE-2026-74312

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74312

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "0f310bac6db9bd3bb1655707d692d9d2a86eeb17",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "4bf5a51963ff816f7443702dc536b9327cf5e550",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "55a644031e610ea93fbde2702c7b8f267476552f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "2b3f79b90b231a682315fe2191bb71925650e183",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "bbba4f92515238d76018e9b75e41b16d83df52c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
        "lessThan": "929e4f044621c8cc30b612fb74e1410bef09e41b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/vhost/vdpa.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/vhost/vdpa.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74312

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33091 · Revision 1
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Publisher date
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