CVE-2026-74312 (GCVE-0-2026-74312)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-10-16 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9
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This allows an out-of-range queue index to reach\\ndriver-specific get_vq_notification() callbacks.\\n\\nFix this by extracting a unified vhost_vdpa_get_vq_notification()\\nhelper that validates the queue index against v-\u003envqs and applies\\narray_index_nospec() before calling the driver callback. Both the\\nmmap and fault paths use this helper, and the bounds checking is\\nconsolidated into a single location.\\n\\nFrom source inspection, the most defensible impact is out-of-bounds\\naccess in the callback path, potentially leading to invalid PFN\\nremaps and crash/DoS.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:45:44.929Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74312\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:32.188Z\", \"dateReserved\": \"2026-08-15T05:44:03.883Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:58:11.395Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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