A new KB is in the process of being published on an SCVMM update for Red Hat Linux running on Hyper-V. This information is currently available as a blog post, containing the same information. Those of you wanting the 'official' KB will have it soon enough.
Read the article here: http://blogs.technet.com/jonjor/archive/2010/04/02/scvmm-reports-error-10637-when-red-hat-linux-selected-as-the-operating-system.aspx
URL of KB when published: http://support.microsoft.com/kb/2022557