The libvirt library is a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.
A use-after-free flaw was found in the way several libvirt block APIs handled domain jobs. A remote attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd or, potentially, execute arbitrary code with the privileges of the libvirtd process (usually root). (CVE-2013-6458)
A race condition was found in the way libvirtd handled keepalive initialization requests when the connection was closed prior to establishing connection credentials. An attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd, resulting in a denial of service. (CVE-2014-1447)
This update also fixes the following bug:
All libvirt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.