/usr/lib/x86_64-linux-gnu/libnl-idiag-3.so is in libnl-idiag-3-dev 3.2.27-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnl-idiag-3.so.200.22.0
/usr/lib/x86_64-linux-gnu/libnl-idiag-3.so.200.22.0