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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2011:0919
The remote host is missing updates announced in
advisory RHSA-2011:0919.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component
for running virtual machines using KVM.

It was found that the virtio subsystem in qemu-kvm did not properly
validate virtqueue in and out requests from the guest. A privileged guest
user could use this flaw to trigger a buffer overflow, allowing them to
crash the guest (denial of service) or, possibly, escalate their privileges
on the host. (CVE-2011-2212)

It was found that the virtio_queue_notify() function in qemu-kvm did not
perform sufficient input validation on the value later used as an index
into the array of virtqueues. An unprivileged guest user could use this
flaw to crash the guest (denial of service) or, possibly, escalate their
privileges on the host. (CVE-2011-2512)

Red Hat would like to thank Nelson Elhage for reporting CVE-2011-2212.

This update also fixes the following bug:

* A bug was found in the way vhost (in qemu-kvm) set up mappings with the
host kernel's vhost module. This could result in the host kernel's vhost
module not having a complete view of a guest system's memory, if that guest
had more than 4 GB of memory. Consequently, hot plugging a vhost-net
network device and restarting the guest may have resulted in that device no
longer working. (BZ#701771)

All users of qemu-kvm should upgrade to these updated packages, which
contain backported patches to resolve these issues. After installing this
update, shut down all running virtual machines. Once all virtual machines
have shut down, start them again for this update to take effect.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-2212
Debian Security Information: DSA-2282 (Google Search)
RedHat Security Advisories: RHSA-2011:0919
SuSE Security Announcement: SUSE-SU-2011:0806 (Google Search)
SuSE Security Announcement: openSUSE-SU-2011:0803 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2011-2512
Debian Security Information: DSA-2270 (Google Search)
CopyrightCopyright (c) 2011 E-Soft Inc.

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