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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1031998
SecurityTracker URL:  http://securitytracker.com/id/1031998
CVE Reference:   CVE-2015-2756   (Links to External Site)
Date:  Apr 1 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.3 and later
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the target host system.

A local user on an HVM guest system can modify the PCI command register of a device passed through to the guest to trigger unsupported request responses that, in certain cases, may cause the host system to crash.

Only x86 systems are affected.

ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause the target host system to crash.
Solution:   The vendor has issued a fix (xsa126-qemut.patch, xsa126-qemuu.patch, xsa126-qemuu-4.3.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-126.html

Vendor URL:  xenbits.xen.org/xsa/advisory-126.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 19 2015 (Citrix Issues Fix for Citrix XenServer) Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System
Citrix has issued a fix for Citrix XenServer 6.0.0, 6.0.2, 6.1, 6.2 SP1, 6.5, and 6.5 SP1.
Aug 3 2016 (Citrix Issues Fix for Citrix NetScaler Service Delivery Appliance) Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System
Citrix has issued a fix for Citrix NetScaler Service Delivery Appliance (SDX).



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