hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
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.
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
- Added to Heist Feed
- Publisher date