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Description: Linux af_packet.c race condition
References:
 http://www.openwall.com/lists/oss-security/2016/12/06/1
Notes:
 carnil> Introduced in 3.2-rc1 with f6fb8f100b807378fda19e83e5ac6828b638603a
 bwh> But AF_PACKET is only usable with CAP_NET_RAW, so is not so serious a
 bwh> vulnerability without unprivileged user namespaces enabled.
Bugs:
upstream: released (4.9-rc8) [84ac7260236a49c79eede91617700174c2c19b0c]
3.16-upstream-stable: released (3.16.40) [packet-fix-race-condition-in-packet_set_ring.patch]
3.2-upstream-stable: released (3.2.85) [packet-fix-race-condition-in-packet_set_ring.patch]
sid: released (4.8.15-1)
3.16-jessie-security: released (3.16.39-1) [bugfix/all/packet-fix-race-condition-in-packet_set_ring.patch]
3.2-wheezy-security: released (3.2.84-1) [bugfix/all/packet-fix-race-condition-in-packet_set_ring.patch]

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