According to security research from Cambridge University (UK) Computer Lab;
To collect the information needed for the research, Cambridge University published an Android app called Device Analyzer. If you have a Priv, please install Device Analyzer in an attempt to get Priv listed and showing very good results on the Android Vulnerability Web page. Please note, I was unable to determine if this study is still collecting data and updating the Web pages.
The problem with the lack of updates to Android devices is well known and recently Google and Samsung have committed to shipping security updates every month. Our hope is that by quantifying the problem we can help people when choosing a device and that this in turn will provide an incentive for other manufacturers and operators to deliver updates.
BlackBerry has also commented to monthly patching and updates. Additionally, they plan to quickly push patches for some high risk vulnerabilities. This commitment may only apply to certain Privs, such as those purchased from the BlackBerry store. Unfortunately, if you buy your phone from a carrier store, you may be subject to the carrier update schedule.