CVE-2011-2189

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.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629373&gt;
• <https://bugs.launchpad.net/ubuntu/+source/vsftpd/+bug/790863&gt;