Medium 5.5Published Jul 24, 2026

CVE-2026-64213hwmon: (lm90) Add lock protection to lm90_alert

Updated under an hour ago (Oct 27, 2026, 7:23 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Add lock protection to lm90_alert Sashiko reports: lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock. Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it. If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register. This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm. Add the missing lock to lm90_alert() to solve the problem.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	7a1d220ccb0cc2b808eb176fb05bf55a38179f3f builds before 02b88fa993582b4fe228b4143b330b0bb9f28353; from 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f before 165ef777ec6f634a5e4b8d9b0dadca8ef91fa90e; from 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f before bed1fc32e0eb653806fa98afcf55f9a311fc4ce2; from 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f before b0b66aae8a94c3663d47e4000b0e81b89ce32186; from 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f before 873e919e3101063a7a75989510ccfc125a4391cf	CNA record
linux linux_kernel linux:linux_kernel	from 5.3 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1	NVD

References

References

https://git.kernel.org/stable/c/02b88fa993582b4fe228b4143b330b0bb9f28353
https://git.kernel.org/stable/c/165ef777ec6f634a5e4b8d9b0dadca8ef91fa90e
https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2	patch
https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186	patch
https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.