🛡️ CVE-2026-46292 — kernel

pmdomain: core: Fix detach procedure for virtual devices in genpd

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

pmdomain: core: Fix detach procedure for virtual devices in genpd

If a device is attached to a PM domain through genpd_dev_pm_attach_by_id(),

genpd calls pm_runtime_enable() for the corresponding virtual device that

it registers. While this avoids boilerplate code in drivers, there is no

corresponding call to pm_runtime_disable() in genpd_dev_pm_detach().

This means these virtual devices are typically detached from its genpd,

while runtime PM remains enabled for them, which is not how things are

designed to work. In worst cases it may lead to critical errors, like a

NULL pointer dereference bug in genpd_runtime_suspend(), which was recently

reported. For another case, we may end up keeping an unnecessary vote for a

performance state for the device.

To fix these problems, let's add this missing call to pm_runtime_disable()

in genpd_dev_pm_detach().