vhost-scsi: Validate T10 PI scatterlist counts

{
  "id": "266e5d84c53404661478c7b70397de271f3fd9068e7fe0d09cdc35bbea53a1ff",
  "url": "https://osv.dev/vulnerability/CVE-2026-74703",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vhost-scsi: Validate T10 PI scatterlist counts",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vhost-scsi: Validate T10 PI scatterlist counts When T10 PI is negotiated, vhost-scsi splits protection bytes from the data iterator before mapping the request scatterlists. A malformed request can claim protection bytes that cover or exceed the full payload length. The former leaves no data bytes to map, while the latter underflows exp_data_len before advancing the iterator. Both cases can let a zero data SGL count reach sg_alloc_table_chained(), which triggers BUG_ON(!nents). Reject protection lengths that cover or exceed the payload before subtracting prot_bytes and advancing the iterator. Also propagate negative errors from the protection SGL calculation before calling the allocator, matching the data SGL path.",
    "evidence": "osv:CVE-2026-74703",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74703",
      "aliases": [
        "CVE-2026-74703"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "bca939d5bcd00d6faea99c47eafd60bed573ef03"
                },
                {
                  "fixed": "2417a498cf3fe64d06faf87e236eda98dd4f04e0"
                },
                {
                  "fixed": "f8fe3f8d342da750dd10361bf66009fd3072926b"
                },
                {
                  "fixed": "d876c493fc4b811941bfeb4c80beb2dfc4bf025e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74703.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.18.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74703.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.537888441Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2417a498cf3fe64d06faf87e236eda98dd4f04e0",
        "https://git.kernel.org/stable/c/d876c493fc4b811941bfeb4c80beb2dfc4bf025e",
        "https://git.kernel.org/stable/c/f8fe3f8d342da750dd10361bf66009fd3072926b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74703.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74703",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74703.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74703",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489835,
  "published_at": "2026-08-22T15:33:02.872+00:00"
}