CVE-2026-90333 (GCVE-0-2026-90333)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
dm-integrity: replace forgeable discard filler with a keyed sector marker
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 (git)
Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 6228722c27304e4682cddc1fede03898f87e4414 (git)
Affected: 84597a44a9d86ac949900441cea7da0af0f2f473 , < 68c5c42567bc462139128968ebbfadd0aefff519 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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            "Documentation/admin-guide/device-mapper/dm-ima.rst",
            "Documentation/admin-guide/device-mapper/dm-integrity.rst",
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              "negate": false,
              "operator": "OR"
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        {
          "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": "2026-09-17T16:08:46.805Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6228722c27304e4682cddc1fede03898f87e4414"
        },
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          "url": "https://git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519"
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    "datePublished": "2026-09-17T16:08:46.805Z",
    "dateReserved": "2026-09-11T19:38:34.803Z",
    "dateUpdated": "2026-09-17T16:08:46.805Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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      "date": "2026-09-25",
      "epss": "0.00206",
      "percentile": "0.09484"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-24T02:05:00.000Z",
      "cve": "CVE-2026-90333",
      "id": "msrc_CVE-2026-90333",
      "initial_release_date": "2026-09-19T01:19:31.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "dm-integrity: replace forgeable discard filler with a keyed sector marker",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90333.json",
      "version": "4"
    },
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                ],
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                ],
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        "cveTags": [],
        "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()."
          }
        ],
        "id": "CVE-2026-90333",
        "lastModified": "2026-09-17T17:17:31.830",
        "metrics": {},
        "published": "2026-09-17T17:17:31.830",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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