Red Hat: 2012:0149-03: kvm: Moderate Advisory
Summary
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for
the standard Red Hat Enterprise Linux kernel.
It was found that the kvm_vm_ioctl_assign_device() function in the KVM
subsystem of a Linux kernel did not check if the user requesting device
assignment was privileged or not. A member of the kvm group on the host
could assign unused PCI devices, or even devices that were in use and
whose resources were not properly claimed by the respective drivers, which
could result in the host crashing. (CVE-2011-4347)
Red Hat would like to thank Sasha Levin for reporting this issue.
These updated kvm packages include several bug fixes. Space precludes
documenting all of these changes in this advisory. Users are directed to
the Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the
References, for information on the most significant of these changes.
All KVM users should upgrade to these updated packages, which contain
backported patches to correct these issues. Note: The procedure in the
Solution section must be performed before this update will take effect.
Summary
Solution
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259
The following procedure must be performed before this update will take
effect:
1) Stop all KVM guest virtual machines.
2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.
3) Restart the KVM guest virtual machines.
References
https://www.redhat.com/security/data/cve/CVE-2011-4347.html https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/search/
Package List
RHEL Desktop Multi OS (v. 5 client):
Source:
x86_64:
kmod-kvm-83-249.el5.x86_64.rpm
kmod-kvm-debug-83-249.el5.x86_64.rpm
kvm-83-249.el5.x86_64.rpm
kvm-debuginfo-83-249.el5.x86_64.rpm
kvm-qemu-img-83-249.el5.x86_64.rpm
kvm-tools-83-249.el5.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source:
x86_64:
kmod-kvm-83-249.el5.x86_64.rpm
kmod-kvm-debug-83-249.el5.x86_64.rpm
kvm-83-249.el5.x86_64.rpm
kvm-debuginfo-83-249.el5.x86_64.rpm
kvm-qemu-img-83-249.el5.x86_64.rpm
kvm-tools-83-249.el5.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package
Topic
Updated kvm packages that fix one security issue and several bugs are nowavailable for Red Hat Enterprise Linux 5.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.
Topic
Relevant Releases Architectures
RHEL Desktop Multi OS (v. 5 client) - x86_64
RHEL Virtualization (v. 5 server) - x86_64
Bugs Fixed
701616 - limitation on max number of assigned devices does not take effect if hot-plug pci devices
703335 - KVM guest clocks jump forward one hour on reboot
703446 - Failed to ping guest after MTU is changed
704081 - mouse responds very slowly with huge memory
725876 - RTC interrupt problems with RHEL5 qemu/kvm (0.10 based) on 2.6.38+ guest kernels.
753860 - Fix kvm userspace compilation on RHEL-5 to match the kernel changes
756084 - CVE-2011-4347 kernel: kvm: device assignment DoS
