Days after a security flaw in Android’s media playback system Stagefright was publicly revealed, threatening nearly a billion Android devices, another wide-reaching security flaw could be used to make a victim’s Android device completely unresponsive.

According to security firm Trend Micro, which publicly disclosed info about the vulnerability Wednesday, the new security flaw affects all devices running Android 4.3 to the present version, 5.1.1. By Google’s count, that’s around 57 percent of all Android devices in use today — or more than 900 million devices.

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