In the Linux kernel, the following vulnerability has been resolved: ppdev: Add an error check in registerdevice In registerdevice, the return value of idasimpleget is unchecked, in witch idasimpleget will use an invalid index value. To address this issue, index should be checked after idasimpleget. When the index value is abnormal, a warning message should be printed, the port should be dropped, and the value should be recorded.