First off, there was an exploit found in kernel 2.6.24, I think you should be using at least kernel 2.6.24.2. See http://forums.theplanet.com/index.php?showtopic=89616 and http://www.milw0rm.com/exploits/5093.
Then, kernel 2.6.24.x has a separate solution, I used the source from http://rtr.ca/vmware-2.6.24/, the file 115a any-any update.
Now, this solution may fix 2.6.24.x as well as 2.6.25. I finally just signed up for and downloaded VMWare Server 2.0 Beta 2, unpacked it, extracted the module source and used those. They compiled perfectly.
Good luck!
