VulnerabilityPublished 14 Jan 2026Updated 19 Oct 2026

CVE-2025-71111: Linux kernel · Race Condition

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f94800fbc26ccf7c81eb791707b038a57aa39a18 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS

0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-06-10.

Patch

Available – fixed in f94800fbc26ccf7c81eb791707b038a57aa39a18, f2b579a0c37c0df19603d719894a942a295f634a, c8cf0c2bdcccc6634b6915ff793b844e12436680 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < f94800fbc26ccf7c81eb791707b038a57aa39a18	Fixed in f94800fbc26ccf7c81eb791707b038a57aa39a18
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < f2b579a0c37c0df19603d719894a942a295f634a	Fixed in f2b579a0c37c0df19603d719894a942a295f634a
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < c8cf0c2bdcccc6634b6915ff793b844e12436680	Fixed in c8cf0c2bdcccc6634b6915ff793b844e12436680
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < bf5b03227f2e6d4360004886d268f9df8993ef8f	Fixed in bf5b03227f2e6d4360004886d268f9df8993ef8f
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < a9fb6e8835a22f5796c1182ed612daed3fd273af	Fixed in a9fb6e8835a22f5796c1182ed612daed3fd273af
LinuxLinux	Affected ≥ 9873964d6eb24bd0205394f9b791de9eddbcb855, < 670d7ef945d3a84683594429aea6ab2cdfa5ceb4	Fixed in 670d7ef945d3a84683594429aea6ab2cdfa5ceb4

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.

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (opens in a new tab)
Class weaknessLikelihood of exploit: MediumOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Architecture and Design
In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
Architecture and Design
Use thread-safe capabilities such as the data access abstraction in Spring.
Architecture and Design
Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V1.11.2 (opens in a new tab)
Attack patterns
Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions (opens in a new tab)
Leveraging Race Conditions (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

WeaknessesCWE-362

Technical details

References

Community reviews

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