/usr/lib/libsundials_cvode.so.1 is in libsundials-cvode1 2.5.0-3+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libsundials_cvode.so.1.0.0
/usr/lib/libsundials_cvode.so.1.0.0