Scientific Linux 5.x: CVE-2010-4525 Low Severity KVM Stack Leak Fix

Date: Thu, 17 Feb 2011 15:35:50 -0600
Reply-To: Troy Dawson 
Sender: Security Errata for Scientific Linux
 
From: Troy Dawson 
Subject: Security ERRATA Low: kvm on SL5.x x86_64
Comments: To: "This email address is being protected from spambots. You need JavaScript enabled to view it."
 

Synopsis:	Low: kvm security and bug fix update
Issue date:	2011-01-13
CVE Names:	CVE-2010-4525

A data structure field in kvm_vcpu_ioctl_x86_get_vcpu_events() in
QEMU-KVM was not initialized properly before being copied to user-space.
A privileged host user with access to "/dev/kvm" could use this flaw to
leak kernel stack memory to user-space. (CVE-2010-4525)

These updated packages also fix several bugs.

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.

SL 5.x

 SRPMS:
kvm-83-224.el5.src.rpm
 x86_64:
kmod-kvm-83-224.el5.x86_64.rpm
kmod-kvm-debug-83-224.el5.x86_64.rpm
kvm-83-224.el5.x86_64.rpm
kvm-qemu-img-83-224.el5.x86_64.rpm
kvm-tools-83-224.el5.x86_64.rpm

-Connie Sieh
-Troy Dawson