CVE-2025-71111hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
- 4.7MediumCVSS base score
- 0.10%Exploitation in 30 daysEPSS · top 99% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 9 months later
· 9 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.10% · top 99% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Affected products
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < 3dceb68f6ad33156032ef4da21a93d84059cca6d
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < bf5b03227f2e6d4360004886d268f9df8993ef8f
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < f2b579a0c37c0df19603d719894a942a295f634a
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < f94800fbc26ccf7c81eb791707b038a57aa39a18
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < a9fb6e8835a22f5796c1182ed612daed3fd273af
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < c8cf0c2bdcccc6634b6915ff793b844e12436680
- affected 9873964d6eb24bd0205394f9b791de9eddbcb855 – < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4
- affected 2.6.18
- unaffected < 2.6.18
- unaffected 5.10.248 – ≤ 5.10.*
- unaffected 5.15.198 – ≤ 5.15.*
- unaffected 6.1.160 – ≤ 6.1.*
- unaffected 6.6.120 – ≤ 6.6.*
- unaffected 6.12.64 – ≤ 6.12.*
- unaffected 6.18.3 – ≤ 6.18.*
- unaffected 6.19 – ≤ *
References
References7
- https://git.kernel.org/stable/c/3dceb68f6ad33156032ef4da21a93d84059cca6d (opens in a new tab)
- https://git.kernel.org/stable/c/bf5b03227f2e6d4360004886d268f9df8993ef8f (opens in a new tab)
- https://git.kernel.org/stable/c/f2b579a0c37c0df19603d719894a942a295f634a (opens in a new tab)
- https://git.kernel.org/stable/c/f94800fbc26ccf7c81eb791707b038a57aa39a18 (opens in a new tab)
- https://git.kernel.org/stable/c/a9fb6e8835a22f5796c1182ed612daed3fd273af (opens in a new tab)
- https://git.kernel.org/stable/c/c8cf0c2bdcccc6634b6915ff793b844e12436680 (opens in a new tab)
- https://git.kernel.org/stable/c/670d7ef945d3a84683594429aea6ab2cdfa5ceb4 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-2501 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-71111)Record last updated .