Well, this is scary. It's been discovered that smartphones from Lenovo, Huawei and other Chinese brands which make use of MediaTek chipsets may be affected by an "accidental backdoor." The chipset contained code that left open root access for purposes of debugging, but the debugging code was never removed in production versions of the chipset. It's not yet clear how many devices are affected, though it sounds like only those on Android 4.4 KitKat with MediaTek's MT6582 may be at risk.