Kernel memory disclosure via short filehandle initialization

Information disclosure in the Linux FAT filesystem allows local users to read uninitialized kernel memory through parentless file handles. fat_encode_fh_nostale() initializes only 10 bytes when producing a 12-byte handle, leaving the final two bytes uninitialized before the handle reaches user space. Exploitation requires local low-privileged access and generation of a parentless FAT file handle; the bounded result is disclosure of two uninitialized kernel bytes per affected handle.