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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Cacheability Mapping Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1035042
SecurityTracker URL:  http://securitytracker.com/id/1035042
CVE Reference:   CVE-2016-2270   (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 host system.

A local administrative user on the guest system can exploit a flaw in multiple mappings of a physical page with different cacheability settings to trigger a machine check exception and cause the host system to reboot.

x86 guests that have control over a physical device can trigger this flaw.

x86 systems are affected. ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local administrative user on the guest system can cause the host system to reboot.
Solution:   The vendor has issued a fix (xsa154-4.3.patch, xsa154-4.4.patch, xsa154-4.5.patch, xsa154-4.6.patch, and xsa154.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-154.html

Vendor URL:  xenbits.xen.org/xsa/advisory-154.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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