CVE-2026-74685 (GCVE-0-2026-74685)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
hwmon: (ltc4282) Clamp negative current limits
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < 60e06c4dba696173982393252a40ceb7dd2eec18 (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < de58b90a4d1417c15b693eb04c0ce6bc925d84c6 (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < 046e56b53c09375ef39903514496aa5508db9729 (git)
Affected: cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 , < e253dd5f9f6d875a317895bf43ec9534ed7523cb (git)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "cveId": "CVE-2026-74685",
    "datePublished": "2026-08-22T15:32:51.493Z",
    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-22T15:32:51.493Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T13:32:26+00:00",
      "cve": "CVE-2026-74685",
      "id": "CVE-2026-74685",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (ltc4282) Clamp negative current limits",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74685.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.