CF Auto root has been ported for the Samsung Galaxy Tab S2 android tablet. This will allow you to gain root access on to it. All credits go to folks at galaxytabreview.com in finding the way to achieve root on the tablet.
Download the files required for doing CF auto root from galaxytabreview.com and flash then using ODIN application on desktop. Custom recovery for all variants of Galaxy Tab S2 is also available including T710, T715, T810 and T815 which you can download from here.
Custom recovery for the Samsung Galaxy Tab S2 will allow you to flash custom firmwares and all sorts of hacks including overclocking and underclocking hacks.
Galaxy Tab S2 specs include quad core processor, 32/64GB flash storage, 3GB RAM, 8 inch display, retina resolution, Android 5 lollipop, 8 MP camera capable of taking 3264 x 2448 pixel photo with autofocus and a non-removable Li-Ion 4000 mAh battery.