Google has rolled new updated build for seven Nexus devices to fix Stagefright issue. These seven Nexus devices include all Nexus 6, Nexus 5, Nexus 10, nexus 9, nexus 7 2013.
Google has issued the update and has confirmed it via a blog post on the official blog. You can wait for the OTA update or can flash a fresh build from the source link below.
As per the Google it is the first kind of its update and will rollout firstly on the Nexus devices. It is not the normal update with some features its fully security oriented. We can expect same update on other OEM devices.