It is quite shocking by reading the heading of this story. Well, according to the sources, he attended CBI office in respective a bribery case.
Going into the details, CBI arrested a censor board official regarding the bribery case with respective to a movie called Andaala Chandamama. As a part of trial, Vishnu is attending the enquiry in order to help the prosecution.
Not only Vishnu, many other film personalities are also attending this enquiry and these were all who certified their films at the time of that accused were in the censor panel. We have to wait and see how this case unfolds and Vishnu’s witness help the prosecution.