debuggerd/debuggerd.cpp in Debuggerd in Android 5.0.x before 5.0.2, 5.1.x before 5.1.1, 6.x before 2016-09-01, and 7.0 before 2016-09-01 mishandles the interaction between PTRACE_ATTACH operations and thread exits, which allows attackers to gain privileges via a crafted application, aka internal bug 29555636.
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