URGENT: What are these MS Security articles for?

Hello,

We have been given a list of Security Updates to download and install on Server 2008 R2, but some of these are taking us to webpages where it appears to only be an advisory to a security vulnerability and there is no security update to download.

Examples include: http://support.microsoft.com/kb/2543893

http://support.microsoft.com/kb/2500212

http://support.microsoft.com/kb/2664258

We cannot find the security update download link when using the KB number neither, is anyone able to explain what we are supposed to do with these?

Regards and Thanks.