{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/xen-scsifront.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1d91ec793d6c80eca963d426e0da832d40a062df",
              "status": "affected",
              "version": "6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43",
              "versionType": "git"
            },
            {
              "lessThan": "15791e57f57f7050014d08cfe239d4aa1e6b94b0",
              "status": "affected",
              "version": "6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43",
              "versionType": "git"
            },
            {
              "lessThan": "8c8222c255772713eb36cde695777a1fce224917",
              "status": "affected",
              "version": "6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/xen-scsifront.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.59",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.13",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: xen/scsifront: Check for a NULL shadow entry on a backend response\n\nscsifront_do_response() validates the rqid in a backend response against\nVSCSIIF_MAX_REQS before using it to index info-\u003eshadow[], but then\ndereferences the entry to test -\u003einflight without checking that the slot\nis populated.  Shadow slots are NULL before a command is submitted (the\nhost private area is zeroed at allocation) and are reset to NULL in\n_scsifront_put_rqid() once a request completes, so an in-range rqid that\ndoes not correspond to an outstanding request makes the frontend\ndereference a NULL pointer.\n\nA malicious or buggy backend can thus crash the guest by returning a\nresponse whose rqid is in range but not in flight -- for example a\nspurious response before any command has been issued, or a duplicate of\none already completed.  The ring has only VSCSIIF_MAX_REQS (16) slots,\nso before the first command every in-range rqid selects a NULL slot.\n\nReject a response whose shadow slot is not populated."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:35:09.733Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1d91ec793d6c80eca963d426e0da832d40a062df"
        },
        {
          "url": "https://git.kernel.org/stable/c/15791e57f57f7050014d08cfe239d4aa1e6b94b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c8222c255772713eb36cde695777a1fce224917"
        }
      ],
      "title": "scsi: xen/scsifront: Check for a NULL shadow entry on a backend response",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99155",
    "datePublished": "2026-10-28T10:35:09.733Z",
    "dateReserved": "2026-09-25T10:25:14.397Z",
    "dateUpdated": "2026-10-28T10:35:09.733Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}