CVE-2011-2189: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 17.9% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 10.10 only; version 11.04 only; version 11.10 only
• Debian Debian Linux: version 5.0 only; version 6.0 only; version 7.0 only
• Linux Linux Kernel: up to and including 2.6.32
• Red Hat Enterprise Linux: version 6.0 only
• Red Hat Enterprise Mrg: version 2.0 only

Published 2011-10-10. Last modified 2026-06-16.