CVE-2025-71111 (GCVE-0-2025-71111)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-05-11 21:55
VLAI?
Title
hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < 3dceb68f6ad33156032ef4da21a93d84059cca6d (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < bf5b03227f2e6d4360004886d268f9df8993ef8f (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < f2b579a0c37c0df19603d719894a942a295f634a (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < f94800fbc26ccf7c81eb791707b038a57aa39a18 (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < a9fb6e8835a22f5796c1182ed612daed3fd273af (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < c8cf0c2bdcccc6634b6915ff793b844e12436680 (git)
Affected: 9873964d6eb24bd0205394f9b791de9eddbcb855 , < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4 (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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}


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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.