dm-integrity: fix buffer overflow in inline mode with large tag size

{
  "id": "7027e3cf48b43111bc3aafc83922fa9cec53b00b4769377218ba5675dbd411e2",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-99098",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dm-integrity: fix buffer overflow in inline mode with large tag size",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix buffer overflow in inline mode with large tag size In inline mode, dm_integrity_check and dm_integrity_inline_recheck compute the checksum of each block into an on-stack buffer of HASH_MAX_DIGESTSIZE bytes. integrity_sector_checksum pads its result with zeroes up to the tag size, so if the tag size is larger than HASH_MAX_DIGESTSIZE, the padding runs past the end of the buffer. With CONFIG_STACKPROTECTOR the kernel panics in dm_integrity_check on the first read. Enlarge both buffers to hold MAX_TAG_SIZE bytes, as commit b93b6643e9b5 (\"dm integrity: fix a crash with unusually large tag size\") did for integrity_metadata. Note that this is not a security bug because the buffer overflow can only be triggered by root.",
    "evidence": "cve:CVE-2026-99098",
    "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-2026-99098",
      "aliases": [
        "CVE-2026-99098"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "fb0987682c629c1d2c476f35f6fde405a5e304a4",
              "lessThan": "3c7aad85aeb9e28386672e3a009aa2e61f751b86",
              "versionType": "git"
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              "versionType": "git"
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          ],
          "programFiles": [
            "drivers/md/dm-integrity.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
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              "version": "6.18.57",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
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          ],
          "programFiles": [
            "drivers/md/dm-integrity.c"
          ],
          "defaultStatus": "affected"
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      ],
      "modified": "2026-10-26T14:52:04.416Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/3c7aad85aeb9e28386672e3a009aa2e61f751b86",
        "https://git.kernel.org/stable/c/4f0ee735dc68e3e6c4dd9a666d7f7047163c4165",
        "https://git.kernel.org/stable/c/f49cd7820cd0a96f20e1aa2708adb002124e38a7",
        "https://git.kernel.org/stable/c/764b683a6180fd72c931c13fea98d383506a3475"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T14:52:04.416Z"
        }
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    },
    "related_cves": [
      {
        "value": "CVE-2026-99098",
        "evidence": "/cveMetadata/cveId"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 311613,
  "published_at": "2026-10-26T14:52:04.416+00:00"
}