CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's hwmon subsystem, specifically within the lm90 driver, where improper handling of device cleanup can lead to use-after-free conditions. This flaw allows for potential exploitation during the window between the hwmon device being freed and the cancellation of associated delayed work, which could result in system instability or arbitrary code execution. Organizations using affected Linux kernel versions should prioritize patching this vulnerability to mitigate risks associated with device management and system integrity.
Original NVD 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 to prevent workers from being re-armed.