firmware: arm_scmi: Validate SENSOR_UPDATE payload size

{
  "id": "0e5fb12981bf180bebb07726d27caecaa18c6960c45e79d3a6649809d1135557",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98893",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firmware: arm_scmi: Validate SENSOR_UPDATE payload size",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Validate SENSOR_UPDATE payload size SENSOR_UPDATE carries one or more sensor readings after the fixed notification header. The parser derives the expected reading count from the sensor description, but it did not verify that the received payload contains those entries before parsing them. Reject truncated update notifications before reading the variable array.",
    "evidence": "cve:CVE-2026-98893",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98893",
      "aliases": [
        "CVE-2026-98893"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "e543d60f966a5f5c92298720c2fd1810f85a6be3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "87a72e75f7560ea45cd28870194eaa153dd19e75",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "1bbe431fc59704d012660647516f6f94ddd82564",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "c148ff2f5a168e0bc41d801efca6ee35a376cfcb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "767789a58ae0d65ec3028e5b5b4da82210355d00",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3811190acf85c63518fbddaa28bcbfab2baa58d",
              "lessThan": "32bc5496b48174dbca1f187f710955ee4d9527a1",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/firmware/arm_scmi/sensors.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/firmware/arm_scmi/sensors.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:56:19.302Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/e543d60f966a5f5c92298720c2fd1810f85a6be3",
        "https://git.kernel.org/stable/c/87a72e75f7560ea45cd28870194eaa153dd19e75",
        "https://git.kernel.org/stable/c/1bbe431fc59704d012660647516f6f94ddd82564",
        "https://git.kernel.org/stable/c/c148ff2f5a168e0bc41d801efca6ee35a376cfcb",
        "https://git.kernel.org/stable/c/767789a58ae0d65ec3028e5b5b4da82210355d00",
        "https://git.kernel.org/stable/c/32bc5496b48174dbca1f187f710955ee4d9527a1"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:56:19.302Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98893",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263351,
  "published_at": "2026-10-23T11:37:54.017+00:00"
}