CVE-2026-64038

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (lm90) Stop work before releasing hwmon device

Sashiko reports:

In lm90_probe(), the devm action to cancel the alert_work and report_work

(lm90_restore_conf) is registered in lm90_init_client() before

devm_hwmon_device_register_with_info() is called.

Because devm executes cleanup actions in reverse order during module

unbind or probe failure, the hwmon device is unregistered and freed first.

If lm90_alert_work() or lm90_report_alarms() runs in the window between

the hwmon device being freed and the delayed works being cancelled,

lm90_update_alarms() will dereference the freed data->hwmon_dev here.

Fix the problem by canceling the workers separately after registering

the hwmon device and before registering the interrupt handler. This ensures

that the workers are canceled after interrupts are disabled and before

the hwmon device is released. Add "shutdown" flag to indicate that device

shutdown is in progress

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References