A denial of service flaw was found in the way ibacm, an InfiniBand communication manager assistant, performed management of reference counts for multicast connections. The default reference count value for multicast connection is set to zero and when the multicast connection got released, an attempt was made to free it, possibly resulting in ib_acm service / daemon crash.
This issue affects the version of the ibacm package, as shipped with Red Hat Enterprise Linux 6.
This was assigned CVE-2012-4517.
This issue has been addressed in following products:
Red Hat Enterprise Linux 6
Via RHSA-2013:0509 https://rhn.redhat.com/errata/RHSA-2013-0509.html