Linux vulnerability

What happened

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 to prevent workers from being re-armed.

Affected versions

Linux: f6d0775119fb905fb02eafa98d575cf8ee792d46 through before c98107817b0f6cdf51adc5e84e75c39ee25d8b28 (git); f6d0775119fb905fb02eafa98d575cf8ee792d46 through before 479e297526aeb19c745eac5c1897f455f83dc5f8 (git); f6d0775119fb905fb02eafa98d575cf8ee792d46 through before b09a45601094c7f4ec4db8090b825fa61e169d93 (git); 6.0 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.