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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen vmx_vmexit_handler() Lets Local Users on a Guest System Cause Denial of Service Conditions on the Guest System
SecurityTracker Alert ID:  1035043
SecurityTracker URL:  http://securitytracker.com/id/1035043
CVE Reference:   CVE-2016-2271   (Links to External Site)
Date:  Feb 18 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the guest system.

A local user on an HVM guest system can trigger a flaw in vmx_vmexit_handler() in the processing of certain instruction pointers and cause the guest system to crash.

Intel or Cyrix CPU based systems are affected.

ARM and AMD systems are not affected.

Ling Liu of Qihoo 360 Inc. reported this vulnerability.

Impact:   A local user on the guest system can cause the guest system to crash.
Solution:   The vendor has issued a fix (xsa170-4.3.patch, xsa170-4.5.patch, and xsa170.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-170.html

Vendor URL:  xenbits.xen.org/xsa/advisory-170.html (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 21 2016 (Citrix Issues Fix for Citrix XenServer) Xen vmx_vmexit_handler() Lets Local Users on a Guest System Cause Denial of Service Conditions on the Guest System
Citrix has issued a fix for Citrix XenServer.



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