Assuming you installed CUDA 6.5 via RPM or DEB (not runfile), and your top-level
installation exists at /usr/local/cuda-6.5, the following commands should work:

$ cp cusolver_patch_linux_rpmdeb_installation.tar.gz ~
$ cd /usr/local/cuda-6.5/targets/x86_64-linux
$ sudo tar zxvf ~/cusolver_patch_linux_rpmdeb_installation.tar.gz

This will update the cusolver libraries inside
/usr/local/cuda-6.5/targets/x86_64-linux/lib

and the include files inside
/usr/local/cuda-6.5/targets/x86_64-linux/include