CVE-2026-90333 (GCVE-0-2026-90333)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-21 12:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().
References
Impacted products
Vendor Product Version
Linux Linux Version: 84597a44a9d86ac949900441cea7da0af0f2f473
Version: 84597a44a9d86ac949900441cea7da0af0f2f473
Version: 84597a44a9d86ac949900441cea7da0af0f2f473
Version: 84597a44a9d86ac949900441cea7da0af0f2f473
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "Documentation/admin-guide/device-mapper/dm-ima.rst",
            "Documentation/admin-guide/device-mapper/dm-integrity.rst",
            "drivers/md/dm-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            "Documentation/admin-guide/device-mapper/dm-integrity.rst",
            "drivers/md/dm-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.12.114",
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                  "vulnerable": true
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                  "versionEndExcluding": "6.18.52",
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: replace forgeable discard filler with a keyed sector marker\n\nThe discard-block check in dm_integrity_rw_tag() treats a stored tag\nof all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and\nskips HMAC verification. allow_discards is only accepted in\ndm-integrity\u0027s standalone mode. An attacker with raw write access to\nthe backing device, but without the integrity key, can stamp any block\nwith an all-0xf6 tag and have it served as authentic.\n\nAdd a new \"allow_discards_keyed\" target argument that marks discarded\nblocks with a keyed checksum of (salt || sector) instead, computed by\nintegrity_discard_checksum()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:03.593Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/388c3f6496bb8083576d989e6d249ba9807c6b0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775"
        },
        {
          "url": "https://git.kernel.org/stable/c/6228722c27304e4682cddc1fede03898f87e4414"
        },
        {
          "url": "https://git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519"
        }
      ],
      "title": "dm-integrity: replace forgeable discard filler with a keyed sector marker",
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90333",
    "datePublished": "2026-09-17T16:08:46.805Z",
    "dateReserved": "2026-09-11T19:38:34.803Z",
    "dateUpdated": "2026-10-21T12:51:03.593Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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