The MITRE CVE dictionary describes this issue as:
Race condition in the sctp_rcv function in net/sctp/input.c in the Linux kernel before 2.6.29 allows remote attackers to cause a denial of service (system hang) via SCTP packets. NOTE: in some environments, this issue exists because of an incomplete fix for CVE-2011-2482.
Find out more about CVE-2011-4348 from the
MITRE CVE dictionary dictionary and
This issue did not affect the version of the Linux kernel as shipped with Red Hat Enterprise Linux 4, 6 and Red Hat Enterprise MRG as they were not vulnerable to CVE-2011-2482. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2012-0007.html.