CVE-2025-37984 (GCVE-0-2025-37984)
Vulnerability from cvelistv5
Published
2025-05-20 17:09
Modified
2025-07-25 13:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa implementation's ->key_size() callback returns an unusually large value. Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7) Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and use it in lieu of DIV_ROUND_UP() for ->key_size() return values. Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes" parameter is a ->key_size() return value in some instances, or a user-specified ASN.1 length in the case of ecdsa_get_signature_rs().
References
Impacted products
Vendor Product Version
Linux Linux Version: 55779f26eab9af12474a447001bd17070f055712
Version: c6ab5c915da460c0397960af3c308386c3f3247b
Version: c6ab5c915da460c0397960af3c308386c3f3247b
Version: c6ab5c915da460c0397960af3c308386c3f3247b
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/ecc.c",
            "crypto/ecdsa-p1363.c",
            "crypto/ecdsa-x962.c",
            "include/linux/math.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "55779f26eab9af12474a447001bd17070f055712",
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              "status": "affected",
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
            "crypto/ecc.c",
            "crypto/ecdsa-p1363.c",
            "crypto/ecdsa-x962.c",
            "include/linux/math.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.99",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.99",
                  "versionStartIncluding": "6.6.70",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.39",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
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                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s -\u003ekey_size() callback returns an unusually large value.\nHerbert instead suggests (for a division by 8):\n\n  X / 8 + !!(X \u0026 7)\n\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\nuse it in lieu of DIV_ROUND_UP() for -\u003ekey_size() return values.\n\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \"nbytes\"\nparameter is a -\u003ekey_size() return value in some instances, or a\nuser-specified ASN.1 length in the case of ecdsa_get_signature_rs()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-25T13:44:56.640Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448"
        },
        {
          "url": "https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275"
        }
      ],
      "title": "crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37984",
    "datePublished": "2025-05-20T17:09:18.321Z",
    "dateReserved": "2025-04-16T04:51:23.976Z",
    "dateUpdated": "2025-07-25T13:44:56.640Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37984\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-20T18:15:45.253\",\"lastModified\":\"2025-07-25T14:15:31.667\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s -\u003ekey_size() callback returns an unusually large value.\\nHerbert instead suggests (for a division by 8):\\n\\n  X / 8 + !!(X \u0026 7)\\n\\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\\nuse it in lieu of DIV_ROUND_UP() for -\u003ekey_size() return values.\\n\\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \\\"nbytes\\\"\\nparameter is a -\u003ekey_size() return value in some instances, or a\\nuser-specified ASN.1 length in the case of ecdsa_get_signature_rs().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: crypto: ecdsa - Protecci\u00f3n contra desbordamientos de enteros en DIV_ROUND_UP(). Herbert se\u00f1ala que DIV_ROUND_UP() puede desbordarse innecesariamente si la funci\u00f3n de retorno -\u0026gt;key_size() de una implementaci\u00f3n de ecdsa devuelve un valor inusualmente grande. En su lugar, Herbert sugiere (para una divisi\u00f3n entre 8): X / 8 + !!(X y 7). Con base en esta f\u00f3rmula, introduzca una macro gen\u00e9rica DIV_ROUND_UP_POW2() y \u00fasela en lugar de DIV_ROUND_UP() para los valores de retorno de -\u0026gt;key_size(). Adem\u00e1s, utilice la macro en ecc_digits_from_bytes(), cuyo par\u00e1metro \\\"nbytes\\\" es un valor de retorno de -\u0026gt;key_size() en algunos casos, o una longitud ASN.1 especificada por el usuario en el caso de ecdsa_get_signature_rs().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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