This is probably old news for some but here is an easy way to root you phone and it will disable Knox. I'm also running CyanogenMod 11 with the quantum 3.3 kernel
http://www.w0lfdroid.com/2013/12/Safe-Root-Android-4.3-Galaxy-S3-S4-Note-No-Warranty-Void.html
http://forum.xda-developers.com/showthread.php?t=2565758
http://www.w0lfdroid.com/2013/12/Safe-Root-Android-4.3-Galaxy-S3-S4-Note-No-Warranty-Void.html
http://forum.xda-developers.com/showthread.php?t=2565758