Windows patching from Linux samba server?

[Scott R. Ehrlich]

I have an out-of-box, unpatched CentOS 5 server acting as a samba PDC for a 
handful of Windows XP systems on a domain.    This is on an isolated network - 
no Internet connectivity.

Is there a way to configure the samba server to act as a Windows SUS server for 
patch pushing?   If so, specifically, how?  If not, other than manually 
installing patches on systems or buying a Windows Server license, what other 
options are there?

Thanks.

Scott