CVE-2025-71111 (GCVE-0-2025-71111)
Vulnerability from cvelistv5
Published
2026-01-14 15:05
Modified
2026-02-09 08:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Convert macros to functions to avoid TOCTOU The macro FAN_FROM_REG evaluates its arguments multiple times. When used in lockless contexts involving shared driver data, this leads to Time-of-Check to Time-of-Use (TOCTOU) race conditions, potentially causing divide-by-zero errors. Convert the macro to a static function. This guarantees that arguments are evaluated only once (pass-by-value), preventing the race conditions. Additionally, in store_fan_div, move the calculation of the minimum limit inside the update lock. This ensures that the read-modify-write sequence operates on consistent data. Adhere to the principle of minimal changes by only converting macros that evaluate arguments multiple times and are used in lockless contexts.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
Version: 9873964d6eb24bd0205394f9b791de9eddbcb855
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83791d) Convert macros to functions to avoid TOCTOU\n\nThe macro FAN_FROM_REG evaluates its arguments multiple times. When used\nin lockless contexts involving shared driver data, this leads to\nTime-of-Check to Time-of-Use (TOCTOU) race conditions, potentially\ncausing divide-by-zero errors.\n\nConvert the macro to a static function. This guarantees that arguments\nare evaluated only once (pass-by-value), preventing the race\nconditions.\n\nAdditionally, in store_fan_div, move the calculation of the minimum\nlimit inside the update lock. This ensures that the read-modify-write\nsequence operates on consistent data.\n\nAdhere to the principle of minimal changes by only converting macros\nthat evaluate arguments multiple times and are used in lockless\ncontexts."
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      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:35:05.517Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/670d7ef945d3a84683594429aea6ab2cdfa5ceb4"
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    "cveId": "CVE-2025-71111",
    "datePublished": "2026-01-14T15:05:58.649Z",
    "dateReserved": "2026-01-13T15:30:19.653Z",
    "dateUpdated": "2026-02-09T08:35:05.517Z",
    "state": "PUBLISHED"
  },
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