CVE-2025-68312: 
Linux Kernel vulnerability analysis and mitigation

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

usbnet: Prevents free active kevent

The root cause of this issue are:

1. When probing the usbnet device, executing usbnetlinkchange(dev, 0, 0); put the kevent work in global workqueue. However, the kevent has not yet been scheduled when the usbnet device is unregistered. Therefore, executing free_netdev() results in the "free active object (kevent)" error reported here.

2. Another factor is that when calling usbnetdisconnect()->unregisternetdev(), if the usbnet device is up, ndostop() is executed to cancel the kevent. However, because the device is not up, ndostop() is not executed.

The solution to this problem is to cancel the kevent before executing free_netdev().