The Linux kernel's genpd (generic power domain) subsystem calls pm_runtime_enable() when attaching a device to a power management domain via genpd_dev_pm_attach_by_id(), but it lacked a corresponding pm_runtime_disable() call during detachment in genpd_dev_pm_detach(). This oversight could leave runtime power management enabled on virtual devices after detachment, leading to critical errors like NULL pointer dereference in genpd_runtime_suspend() and improper power state management. The vulnerability is addressed by adding the missing pm_runtime_disable() call in the detach procedure.

This vulnerability can cause critical errors such as NULL pointer dereferences in kernel power management code, potentially leading to system instability or crashes. It may also cause devices to maintain unnecessary power state votes, affecting system performance or power consumption. There is no indication of confidentiality or integrity impact.

A fix has been implemented in the Linux kernel to add the missing pm_runtime_disable() call during device detachment from power management domains. Users should update to the fixed kernel version once available. Patch status is not explicitly confirmed here; check the vendor advisory or Linux kernel updates for the official fix.