CVE-2026-64213

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2
• https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186
• https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf

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