A certain Red Hat patch to the sctp_sock_migrate function in net/sctp/socket.c in the Linux kernel before 2.6.21, as used in Red Hat Enterprise Linux (RHEL) 5, allows remote attackers to cause a denial of service (NULL pointer dereference and OOPS) via a crafted SCTP packet.
ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=ea2bc483ff5caada7c4aa0d5fbf87d3a6590273d
rhn.redhat.com/errata/RHSA-2011-1212.html
www.openwall.com/lists/oss-security/2011/08/30/1
bugzilla.redhat.com/show_bug.cgi?id=714867
github.com/torvalds/linux/commit/ea2bc483ff5caada7c4aa0d5fbf87d3a6590273d