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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel KVM Memory Slot Management Flaw Lets Local Guest Users Deny Service on the Guest Operating System
SecurityTracker Alert ID:  1027083
SecurityTracker URL:  http://securitytracker.com/id/1027083
CVE Reference:   CVE-2012-2121   (Links to External Site)
Date:  May 22 2012
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.3.4
Description:   A vulnerability was reported in the Linux Kernel. A local user on the guest operating system can cause denial of service conditions on the host operating system.

A local user on the guest operating system with privileges to hotunplug and hotplug certain devices can trigger a KVM memory slot and iommu management error to cause the host system to crash.

Impact:   A local privileged user on the guest operating system can cause the target host system to crash.
Solution:   The vendor has issued a fix (3.3.4).

The vendor's advisory is available at:

http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.4

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 22 2012 (Red Hat Issues Fix) Linux Kernel KVM Memory Slot Management Flaw Lets Local Guest Users Deny Service on the Guest Operating System   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Jun 18 2012 (Red Hat Issues Fix) Linux Kernel KVM Memory Slot Management Flaw Lets Local Guest Users Deny Service on the Guest Operating System   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



 Source Message Contents

Date:  Tue, 22 May 2012 02:46:59 +0000
Subject:  Linux Kernel


The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the 
relationships between memory slots and the iommu, which allows guest OS users to cause 
a denial of service (host OS crash) by leveraging administrative access to the guest 
OS to conduct hotunplug and hotplug operations on devices.

CVE-2012-2121
 
 


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