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.
No analysis available yet.
No remediation available yet.
Tracking
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| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4475-1 | linux security update |
Debian DLA |
DLA-4476-1 | linux-6.1 security update |
Debian DSA |
DSA-6126-1 | linux security update |
Debian DSA |
DSA-6127-1 | linux security update |
Ubuntu USN |
USN-8096-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8096-2 | Linux kernel (FIPS) vulnerabilities |
Ubuntu USN |
USN-8096-3 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8096-4 | Linux kernel (Real-time) vulnerabilities |
Ubuntu USN |
USN-8096-5 | Linux kernel (NVIDIA Tegra IGX) vulnerabilities |
Ubuntu USN |
USN-8116-1 | Linux kernel (Intel IoTG Real-time) vulnerabilities |
Wed, 25 Mar 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-367 | |
| CPEs | cpe:2.3:o:linux:linux_kernel:2.6.18:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* |
|
| Metrics |
cvssV3_1
|
cvssV3_1
|
Mon, 19 Jan 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Thu, 15 Jan 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Wed, 14 Jan 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | hwmon: (w83791d) Convert macros to functions to avoid TOCTOU | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
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|
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-02-09T08:35:05.517Z
Reserved: 2026-01-13T15:30:19.653Z
Link: CVE-2025-71111
No data.
Status : Analyzed
Published: 2026-01-14T15:16:00.193
Modified: 2026-03-25T19:27:20.137
Link: CVE-2025-71111
OpenCVE Enrichment
No data.
Debian DLA
Debian DSA
Ubuntu USN