In nbd-server in nbd before 3.24 there is an integer overflow with a resultant heap-based buffer overflow. A value of 0xffffffff in the name length field will cause a zero-sized buffer to be allocated for the name resulting in a write to a dangling pointer. This issue exists for the NBD_OPT_INFO NBD_OPT_GO and NBD_OPT_EXPORT_NAME messages.