server/notification/NotificationManagerService.java in the Notification Manager Service in Android 6.x before 2016-09-01 and 7.0 before 2016-09-01 lacks uid checks, which allows attackers to bypass intended restrictions on method calls via a crafted application, aka internal bug 29421441.
https://android.googlesource.com/platform/frameworks/base/+/61e9103b5725965568e46657f4781dd8f2e5b623
http://www.securitytracker.com/id/1036763