Stagefright could be a very, very big problem for Android. The vulnerability, detailed last week, potentially allows the vast majority of Android devices to be taken over simply by receiving an MMS. It's so easy, which makes it so terrifying.

And it highlights the huge issue with Android device fragmentation. Because manufacturers have to release their own OS updates - and often don't, or take a very long time to do so - users don't get crucial fixes in a timely manner. After all, only 18% of Android users even have Lollipop after nine months. If the percentage of users getting timely security updates is anywhere near that, then a lot of people are being left open to attack.

Google can't update all phones running the OS, due to all the various manufacturer tweaks and alterations, but at least it can make sure Nexus phones, tablets, and other devices are looked after. And that's exactly what it's done today, announcing that the Nexus 4, 5, 6, 7, 9, 10, and Player have all started to receive a security update with fixes for Stagefright and other issues.