libvirt on CentOS 6
Please install the updated Linux Distribution Packages.
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
It was found that libvirtd leaked file descriptors when listing all volumes
for a particular pool. A remote attacker able to establish a read-only
connection to libvirtd could use this flaw to cause libvirtd to consume all
available file descriptors, preventing other users from using libvirtd
services (such as starting a new guest) until libvirtd is restarted.
Red Hat would like to thank Edoardo Comar of IBM for reporting this issue.
This update also fixes the following bugs:
* Previously, libvirt made control group (cgroup) requests on files that
it should not have. With older kernels, such nonsensical cgroup requests
were ignored. However, newer kernels are stricter, resulting in libvirt
logging spurious warnings and failures to the libvirtd and audit logs. The
audit log failures displayed by the ausearch tool were similar to the
root [date] - failed cgroup allow path rw /dev/kqemu
With this update, libvirt no longer attempts the nonsensical cgroup
actions, leaving only valid attempts in the libvirtd and audit logs (making
it easier to search for real cases of failure). (BZ#958837)
* Previously, libvirt used the wrong variable when constructing audit
messages. This led to invalid audit messages, causing ausearch to format
certain entries as having path=(null)' instead of the correct path. This
could prevent ausearch from locating events related to cgroup device ACL
modifications for guests managed by libvirt. With this update, the audit
messages are generated correctly, preventing loss of audit coverage.
All users of libvirt are advised to upgrade to these updated Linux Distribution Packages,
which contain backported patches to correct these issues. After installing
the updated Linux Distribution Packages, libvirtd will be restarted automatically.
CVSS Base Vector:
Linux Distribution Package
NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)
The remote host is missing an update for the 'libvirt'
Linux Distribution Package(s) announced via the referenced advisory.