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Security Advisory Moderate: kvm security update

Advisory: RHSA-2010:0898-1
Type: Security Advisory
Severity: Moderate
Issued on: 2010-12-06
Last updated on: 2010-12-06
Affected Products: RHEL Desktop Multi OS (v. 5 client)
RHEL Virtualization (v. 5 server)
CVEs (cve.mitre.org): CVE-2010-3698

Details

Updated kvm packages that fix one security issue are now available for Red
Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

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.

A flaw was found in the way QEMU-KVM handled the reloading of fs and gs
segment registers when they had invalid selectors. A privileged host user
with access to "/dev/kvm" could use this flaw to crash the host (denial of
service). (CVE-2010-3698)

All KVM users should upgrade to these updated packages, which contain a
backported patch to correct this issue. Note: The procedure in the Solution
section must be performed before this update will take effect.


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
http://kbase.redhat.com/faq/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.

Updated packages

RHEL Desktop Multi OS (v. 5 client)

SRPMS:
kvm-83-164.el5_5.25.src.rpm
File outdated by:  RHSA-2014:0163
    MD5: d76671add889c747fb417f35928b255c
SHA-256: 021b86150eeb0881bbf175078d3b67b109ed69e2f987db0bf15dc3fb83c97370
 
x86_64:
kmod-kvm-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: ff8c03ba00071da30cae8d27e4db570f
SHA-256: bf109d88618c8ba792d8a26f3c1aa4ac82b5048f695a4586942adb19ff717291
kvm-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: bc345804b6919d59633b01a2ef5d7ecf
SHA-256: 013b91cbcdf0151c10aaf3c8ab1893499fd8f758082d5218c9dd80752ce366be
kvm-qemu-img-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: 3a50ec1282a403d152c4805dbf1274fd
SHA-256: e7901778d4166fa6b7aaa46b804d95bab701fe8e53031be996851c6238883a02
kvm-tools-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: 08cf6b03ea6000219399a6c628d4ed18
SHA-256: 3ab240e8ce77e2774caa3e1268bb616fab44d459a3967bd24c9de6a29e379dd8
 
RHEL Virtualization (v. 5 server)

SRPMS:
kvm-83-164.el5_5.25.src.rpm
File outdated by:  RHSA-2014:0163
    MD5: d76671add889c747fb417f35928b255c
SHA-256: 021b86150eeb0881bbf175078d3b67b109ed69e2f987db0bf15dc3fb83c97370
 
x86_64:
kmod-kvm-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: ff8c03ba00071da30cae8d27e4db570f
SHA-256: bf109d88618c8ba792d8a26f3c1aa4ac82b5048f695a4586942adb19ff717291
kvm-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: bc345804b6919d59633b01a2ef5d7ecf
SHA-256: 013b91cbcdf0151c10aaf3c8ab1893499fd8f758082d5218c9dd80752ce366be
kvm-qemu-img-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: 3a50ec1282a403d152c4805dbf1274fd
SHA-256: e7901778d4166fa6b7aaa46b804d95bab701fe8e53031be996851c6238883a02
kvm-tools-83-164.el5_5.25.x86_64.rpm
File outdated by:  RHSA-2014:0163
    MD5: 08cf6b03ea6000219399a6c628d4ed18
SHA-256: 3ab240e8ce77e2774caa3e1268bb616fab44d459a3967bd24c9de6a29e379dd8
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

639879 - CVE-2010-3698 kvm: invalid selector in fs/gs causes kernel panic


References



These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/