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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen SMAP Safety Check Whitelist Error Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1036447
SecurityTracker URL:  http://securitytracker.com/id/1036447
CVE Reference:   CVE-2016-6259   (Links to External Site)
Date:  Jul 26 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system.

A local user on a 32-bit PV guest system can trigger a Supervisor Mode Access Prevention (SMAP) saftey check whitelisting error to cause the target hypervisor to crash and cause denial of service conditions on other guest systems.

x86 hardware supporting the SMAP feature (e.g., Intel Broadwell and later CPUs) is affected.

64-bit PV guests and HVM guests are not affected.

ARM hardware is not affected.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   The vendor has issued a fix (xsa183-4.6.patch and xsa183.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-183.html

Vendor URL:  xenbits.xen.org/xsa/advisory-183.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.
Jul 27 2016 (Citrix Issues Fix for Citrix XenServer) Xen SMAP Safety Check Whitelist Error Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
Citrix has issued a fix for Citrix XenServer.



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