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hwmon: (w83791d) Convert macros to functions to avoid TOCTOU

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-71111

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-71111

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "3dceb68f6ad33156032ef4da21a93d84059cca6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "bf5b03227f2e6d4360004886d268f9df8993ef8f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "f2b579a0c37c0df19603d719894a942a295f634a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "f94800fbc26ccf7c81eb791707b038a57aa39a18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "a9fb6e8835a22f5796c1182ed612daed3fd273af",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "c8cf0c2bdcccc6634b6915ff793b844e12436680",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9873964d6eb24bd0205394f9b791de9eddbcb855",
        "lessThan": "670d7ef945d3a84683594429aea6ab2cdfa5ceb4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/hwmon/w83791d.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.248",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.198",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.120",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.64",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/hwmon/w83791d.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-71111

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#39156 · Revision 1
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Publisher date
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