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Start learningUpgrade RHEL:6 perf to version 0:2.6.32-504.12.2.el6 or higher.
This issue was patched in RHSA-2015:0674.
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.
See How to fix? for RHEL:6 relevant fixed versions and status.
net/netfilter/nf_conntrack_proto_generic.c in the Linux kernel before 3.18 generates incorrect conntrack entries during handling of certain iptables rule sets for the SCTP, DCCP, GRE, and UDP-Lite protocols, which allows remote attackers to bypass intended access restrictions via packets with disallowed port numbers.