net/core/net_namespace.c in the Linux kernel 2.6.32 and earlier does not properly handle a high rate of creation and cleanup of network namespaces, which makes it easier for remote attackers to cause a denial of service (memory consumption) via requests to a daemon that requires a separate namespace per connection, as demonstrated by vsftpd.
http://www.ubuntu.com/usn/USN-1288-1
http://www.openwall.com/lists/oss-security/2011/06/06/20
http://www.openwall.com/lists/oss-security/2011/06/06/10
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-2180
https://bugzilla.redhat.com/show_bug.cgi?id=711245
https://bugzilla.redhat.com/show_bug.cgi?id=711134
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095
http://neil.brown.name/git?p=linux-2.6%3Ba=patch%3Bh=2b035b39970740722598f7a9d548835f9bdd730f
http://kerneltrap.org/mailarchive/git-commits-head/2009/12/8/15289
http://ie.archive.ubuntu.com/linux/kernel/v2.6/ChangeLog-2.6.33