/usr/share/icons/oxy-white/cursors/640fb0e74195791501fd1ed57b41487f is in oxygen-cursor-theme 0.0.2012-06-kde4.8-2.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/icons/oxy-white/cursors/link