{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-37984",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-37984"
  ],
  "published": "2025-05-20T17:07:46Z",
  "summary": "crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()\n\nHerbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa\nimplementation's ->key_size() callback returns an unusually large value.\nHerbert instead suggests (for a division by 8):\n\n  X / 8 + !!(X & 7)\n\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\nuse it in lieu of DIV_ROUND_UP() for ->key_size() return values.\n\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \"nbytes\"\nparameter is a ->key_size() return value in some instances, or a\nuser-specified ASN.1 length in the case of ecdsa_get_signature_rs().",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm"
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            "binary_version": "1:6.6.74-1+rpt1"
          },
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            "binary_version": "1:6.6.74-1+rpt1"
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            "binary_version": "1:6.6.74-1+rpt1"
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
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          },
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            "assessment": "commit ancestry (strak rule)",
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    },
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        "name": "linux"
      },
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        "1:6.12.19-1+rpt1",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-37984"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}