FKIE_CVE-2026-74685

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Clamp negative current limits When a negative value is passed to ltc4282_write_curr(), the signed long val is cast directly to u64: drivers/hwmon/ltc4282.c:ltc4282_write_curr() { /* need to pass it in millivolt */ u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st->rsense, DECA * MICRO); ... } This cast converts negative inputs into large positive values. The subsequent division result overflows the u32 in variable, truncating to a pseudo-random positive value. When this is passed to ltc4282_write_voltage_byte(), it is clamped to the maximum limit instead of zero. Clamp val to 0 and to the maximum supported upper limit before the cast and assign the result to a 64-bit temporary variable before the division to avoid the underflow and an also possible overflow.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/046e56b53c09375ef39903514496aa5508db9729
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/60e06c4dba696173982393252a40ceb7dd2eec18
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de58b90a4d1417c15b693eb04c0ce6bc925d84c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e253dd5f9f6d875a317895bf43ec9534ed7523cb
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/ltc4282.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "60e06c4dba696173982393252a40ceb7dd2eec18",
              "status": "affected",
              "version": "cbc29538dbf7d7400f1ffc5dd5713e6a551463a0",
              "versionType": "git"
            },
            {
              "lessThan": "de58b90a4d1417c15b693eb04c0ce6bc925d84c6",
              "status": "affected",
              "version": "cbc29538dbf7d7400f1ffc5dd5713e6a551463a0",
              "versionType": "git"
            },
            {
              "lessThan": "046e56b53c09375ef39903514496aa5508db9729",
              "status": "affected",
              "version": "cbc29538dbf7d7400f1ffc5dd5713e6a551463a0",
              "versionType": "git"
            },
            {
              "lessThan": "e253dd5f9f6d875a317895bf43ec9534ed7523cb",
              "status": "affected",
              "version": "cbc29538dbf7d7400f1ffc5dd5713e6a551463a0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/ltc4282.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (ltc4282) Clamp negative current limits\n\nWhen a negative value is passed to ltc4282_write_curr(), the signed long\nval is cast directly to u64:\n\ndrivers/hwmon/ltc4282.c:ltc4282_write_curr() {\n        /* need to pass it in millivolt */\n        u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st-\u003ersense, DECA * MICRO);\n        ...\n}\n\nThis cast converts negative inputs into large positive values. The\nsubsequent division result overflows the u32 in variable, truncating\nto a pseudo-random positive value. When this is passed to\nltc4282_write_voltage_byte(), it is clamped to the maximum limit instead\nof zero.\n\nClamp val to 0 and to the maximum supported upper limit before the cast\nand assign the result to a 64-bit temporary variable before the division\nto avoid the underflow and an also possible overflow."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhwmon: (ltc4282) Limitar los l\u00edmites de corriente negativos\n\nCuando se pasa un valor negativo a ltc4282_write_curr(), el \u0027signed long\u0027 \u0027val\u0027 se convierte directamente a \u0027u64\u0027:\n\ndrivers/hwmon/ltc4282.c:ltc4282_write_curr() {\n        /* es necesario pasarlo en milivoltios */\n        u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st -\u003e rsense, DECA * MICRO);\n        ...\n}\n\nEsta conversi\u00f3n convierte las entradas negativas en valores positivos grandes. El resultado de la divisi\u00f3n subsiguiente desborda la variable \u0027u32 in\u0027, trunc\u00e1ndose a un valor positivo pseudoaleatorio. Cuando esto se pasa a ltc4282_write_voltage_byte(), se limita al l\u00edmite m\u00e1ximo en lugar de cero.\n\nLimitar \u0027val\u0027 a 0 y al l\u00edmite superior m\u00e1ximo soportado antes de la conversi\u00f3n y asignar el resultado a una variable temporal de 64 bits antes de la divisi\u00f3n para evitar el subdesbordamiento y un posible desbordamiento tambi\u00e9n."
    }
  ],
  "id": "CVE-2026-74685",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {},
  "published": "2026-08-22T16:16:42.870",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/046e56b53c09375ef39903514496aa5508db9729"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/60e06c4dba696173982393252a40ceb7dd2eec18"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de58b90a4d1417c15b693eb04c0ce6bc925d84c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e253dd5f9f6d875a317895bf43ec9534ed7523cb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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