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The monthly Android security update released this week fixes the serious Dirty COW privilege escalation attack that can allow malicious apps to take full control of devices.
Dirty COW (copy-on-write) is a privilege escalation vulnerability that has existed in the Linux kernel for the past nine years and is already being exploited in the wild. It affects Android because the mobile OS is based on Linux, but it was initially believed that the SELinux security policies enforced by default in Android provided some mitigation against the attack.
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