In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer deference in trytoregistercard In trytoregistercard(), the return value of usbifnumtoif() is passed directly to usbinterfaceclaimed() without a NULL check, which will lead to a NULL pointer dereference when creating an invalid USB audio device. Fix this by adding a check to ensure the interface pointer is valid before passing it to usbinterface_claimed().