PT-2026-64328 · Linux · Linux
CVE-2026-64213
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Published
2026-07-24
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Updated
2026-07-24
None
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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.
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Related Identifiers
Affected Products
Linux