Earlier this year two large security exploits known as Spectre and Meltdown were reported to exist on modern day CPUs. While Spectre has been confirmed to be exploitable on AMD, Intel, IBM, and ARM, it was previously believed only Intel, IBM, and a handful of ARM's CPUs were vulnerable to Meltdown. However, researchers have confirmed that at least some ARM processors are indeed vulnerable to Meltdown.
https://www.notebookcheck.net/Qualcomm-CPUs-have-been-shown-to-be-unprotected-against-the-Meltdown-exploit-researchers-say.321242.0.html