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Today I was reading about the potential impact of CVE-2016-5696 in Android phones running Linux 3.6+ and though my phone has 3.4 I checked the value of net.ipv4.tcp_challenge_ack_limit and it is also 100, as it is in my OpenVZ VPS running kernel 2.6.32.

My question is, what does exactly determine if a system is vulnerable apart from that parameter? Has it been widely backported to older kernel versions?

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It should affect only Android version 4.4 or higher. According to http://www.heise.de/newsticker/meldung/HTTP-Verbindungen-von-einer-Milliarde-Android-Geraeten-angreifbar-3300328.html one can check if one is vulnerable if sysctl net.ipv4.tcp_challenge_ack_limit gives a value back that is less than 1000, so your device is vulnerable.

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    I'm actually running Marshmallow with monthly security patches (CM13). – user2859982 Aug 17 '16 at 10:00
  • CM is another thing. If it is affected, expect updates shortly. The bug was introduced in kernel 3.06. Redhat backported it access.redhat.com/security/cve/cve-2016-5696 . If it was backported by CM, you would need to ask them, or just wait a little bit and it will resolve itself. – Pozzo-Balbi Aug 17 '16 at 14:21

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