The MITRE CVE dictionary describes this issue as:
The key_notify_policy_flush function in net/key/af_key.c in the Linux kernel before 3.9 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel heap memory by reading a broadcast message from the notify_policy interface of an IPSec key_socket.
Find out more about CVE-2013-2237 from the
MITRE CVE dictionary dictionary and
This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise MRG 2 may address this issue. This issue has been addressed for Red Hat Enterprise Linux 5 via the advisory RHSA-2013:1166 and Red Hat Enterprise Linux 6 via the advisory RHSA-2013:1173.