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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen 'add-to-physmap' Error Processing Failure Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1039220
SecurityTracker URL:  http://securitytracker.com/id/1039220
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 23 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.x, 4.7.x, 4.8.x, 4.9.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 trigger an error condition in add-to-physmap operations and prevent the use of a physical CPU for an arbitrary period of time.

ARM systems are affected.

x86 systems are not affected.

Wei Liu of Citrix reported this vulnerability.

Impact:   A local administrative user on the guest system can prevent the host system from using a physical CPU for an arbitrary period of time.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-235.html

Vendor URL:  xenbits.xen.org/xsa/advisory-235.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


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