A trickier thing for Red Hat might be
> You may not impose any further restrictions on the recipients' exercise of the rights granted herein.
One may argue about how to interpret that with regard to, for example, terminating a business relationship as a result. (I could see arguments on both sides.)
Also, Red Hat's method for complying with section 3 could be a subtle issue, because one of the options for compliance requires promising to provide "any third party" with the source code upon request. I don't know whether Red Hat is using that option or a different option.