It was a bad week for millions of Android phone users. Two critical vulnerabilities were disclosed but remain unpatched in a large percentage of devices, while, separately, malicious apps were downloaded as many as 2.5 million times from Google's official Play Marketplace.
The vulnerabilities, which are similar in severity to the Stagefright family of bugs disclosed last year, have been fixed in updates Google began distributing Tuesday. A large percentage of Android phones, however, aren't eligible to receive the fixes. Even those that do qualify don't receive them immediately (the September updates are currently not available as over-the-air downloads for either of the Nexus 5X devices in my household). That gives attackers crude blueprints for exploiting vulnerabilities that remain unpatched on millions of devices.