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CVE-2025-71111— hwmon: (w83791d) Convert macros to functions to avoid TOCTOU

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于宏多次求值导致TOCTOU竞争条件，可能导致除零错误。

AI Predicted 4.3 Difficulty: Hard EPSS 0.10% · P1

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 9873964d6eb24bd0205394f9b791de9eddbcb855< 3dceb68f6ad33156032ef4da21a93d84059cca6d affected
9873964d6eb24bd0205394f9b791de9eddbcb855< bf5b03227f2e6d4360004886d268f9df8993ef8f affected
9873964d6eb24bd0205394f9b791de9eddbcb855< f2b579a0c37c0df19603d719894a942a295f634a affected
9873964d6eb24bd0205394f9b791de9eddbcb855< f94800fbc26ccf7c81eb791707b038a57aa39a18 affected
9873964d6eb24bd0205394f9b791de9eddbcb855< a9fb6e8835a22f5796c1182ed612daed3fd273af affected
9873964d6eb24bd0205394f9b791de9eddbcb855< c8cf0c2bdcccc6634b6915ff793b844e12436680 affected
9873964d6eb24bd0205394f9b791de9eddbcb855< 670d7ef945d3a84683594429aea6ab2cdfa5ceb4 affected
2.6.18 affected
… +8 more rows
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I. Basic Information for CVE-2025-71111

Vulnerability Information
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Vulnerability Title
hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于宏多次求值导致TOCTOU竞争条件，可能导致除零错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9873964d6eb24bd0205394f9b791de9eddbcb855 ~ 3dceb68f6ad33156032ef4da21a93d84059cca6d -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2025-71111

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III. Intelligence Information for CVE-2025-71111

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Same Patch Batch · Linux · 2026-01-14 · 43 CVEs total

CVE-2025-71116 9.1 CRITICAL libceph: make decode_pool() more resilient against corrupted osdmaps
CVE-2025-71112 8.8 HIGH net: hns3: add VLAN id validation before using
CVE-2025-71130 7.8 HIGH drm/i915/gem: Zero-initialize the eb.vma array in i915_gem_do_execbuffer
CVE-2025-71120 7.5 HIGH SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
CVE-2025-71126 7.5 HIGH mptcp: avoid deadlock on fallback while reinjecting
CVE-2025-71128 7.5 HIGH erspan: Initialize options_len before referencing options.
CVE-2025-71131 7.5 HIGH crypto: seqiv - Do not use req->iv after crypto_aead_encrypt
CVE-2025-71132 7.5 HIGH smc91x: fix broken irq-context in PREEMPT_RT
CVE-2025-71127 7.1 HIGH wifi: mac80211: Discard Beacon frames to non-broadcast address
CVE-2025-71109 7.1 HIGH MIPS: ftrace: Fix memory corruption when kernel is located beyond 32 bits
CVE-2025-71136 7.1 HIGH media: adv7842: Avoid possible out-of-bounds array accesses in adv7842_cp_log_status()
CVE-2025-71123 ext4: fix string copying in parse_apply_sb_mount_options()
CVE-2025-71110 mm/slub: reset KASAN tag in defer_free() before accessing freed memory
CVE-2025-71104 KVM: x86: Fix VM hard lockup after prolonged inactivity with periodic HV timer
CVE-2025-71115 um: init cpu_tasks[] earlier
CVE-2025-71103 drm/msm: adreno: fix deferencing ifpc_reglist when not declared
CVE-2025-71117 block: Remove queue freezing from several sysfs store callbacks
CVE-2025-71118 ACPICA: Avoid walking the Namespace if start_node is NULL
CVE-2025-71102 scs: fix a wrong parameter in __scs_magic
CVE-2025-71105 f2fs: use global inline_xattr_slab instead of per-sb slab cache

Showing top 20 of 43 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71111

Anonymous User
2026-01-15 06:08:15

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