Photoshop :: Jittery Cursor Vibrates Very Fast - CS6 / CC?

The best way to describe it is that the cursor vibrates very fast in some circumstances, especially when using the Brush tool and adjusting its size using Cmd + Alt + Drag, as well as pressing Alt to sample a color when using the Brush tool. The issue does not happen when using the eyedropper tool.
 
Video:
 
This has been around in both Photoshop CS6 and CC, on both OS X Mountain Lion and Mavericks. I have reproduced the bug on both my Late 2008 MacBook Pro using a Wacom Bamboo Fun, a Wacom Intuos 4 and a Wacom Intuos 5 (all with latest drivers) and same with four new iMacs running both Mountain Lion and Mavericks. It does not happen with a mouse. It cannot be interference, as I can always reliably reproduce this is three separate cities around the world.
 
If the Wacom tablet was sending jittery coordinates to the computer, then surely the mouse cursor would also vibrate, or at least the Eyedropper tool would exhibit the same bug that the Brush tool while pressing Alt to color sample does.
 
To test it, please use a Wacom pen and try adjusting the brush size using Cmd + Alt + Drag, as well as using the brush tool and pressing Alt to sample a color (preferably on a photo or noise so that you can clearly see the difference between various pixels and colors. Be sure to not be zoomed in too much, try zooming to 100% or less, otherwise the pixels are too far from each other for the jitter to make a difference.