CVE-2026-64213 is a vulnerability in Linux Kernel
Published on July 24, 2026
hwmon: (lm90) Add lock protection to lm90_alert
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.
Products Associated with CVE-2026-64213
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Affected Versions
Linux:- Version 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f and below bed1fc32e0eb653806fa98afcf55f9a311fc4ce2 is affected.
- Version 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f and below b0b66aae8a94c3663d47e4000b0e81b89ce32186 is affected.
- Version 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f and below 873e919e3101063a7a75989510ccfc125a4391cf is affected.
- Version 5.3 is affected.
- Before 5.3 is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.