In the Linux kernel, the following vulnerability has been resolved: regulator: core: fix NULL dereference on unbind due to stale coupling data Failing to reset couplingdesc.ncoupled after freeing coupledrdevs can lead to NULL pointer dereference when regulators are accessed post-unbind. This can happen during runtime PM or other regulator operations that rely on coupling metadata. For example, on ridesx4, unbinding the 'reg-dummy' platform device triggers a panic in regulatorlockrecursive() due to stale coupling state. Ensure ncoupled is set to 0 to prevent access to invalid pointers.