CVE-2011-4600: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 1.8% chance of exploitation in the next 30 days.

The networkReloadIptablesRules function in network/bridge_driver.c in libvirt before 0.9.9 does not properly handle firewall rules on bridge networks when libvirtd is restarted, which might allow remote attackers to bypass intended access restrictions via a (1) DNS or (2) DHCP query.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only; version 15.10 only
• Red Hat Libvirt: version 0.9.8 only

Published 2016-04-14. Last modified 2026-06-16.