In the Linux kernel, the following vulnerability has been resolved: char: xillybus: fix a refcount leak in cleanup_dev() usb_get_dev is called in xillyusb_probe. So it is better to call usb_put_dev before xdev is released.
https://git.kernel.org/stable/c/e277b95acdab84cd5d2f8d537a37aef6d21e988b
https://git.kernel.org/stable/c/bc8fceda3b89006e8a7dda8a097d36045d044c25
https://git.kernel.org/stable/c/b67d19662fdee275c479d21853bc1239600a798f
https://git.kernel.org/stable/c/21f1f167d727f3f857e26d509ef5a6d47fd31bc3