/usr/src/linux-headers-4.15.0-1019-gcp/virt is in linux-headers-4.15.0-1019-gcp 4.15.0-1019.20.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-4.15.0-1019-gcp/../linux-gcp-headers-4.15.0-1019/virt