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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PV MMU Preemption Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1041201
SecurityTracker URL:  http://securitytracker.com/id/1041201
CVE Reference:   CVE-2018-12891   (Links to External Site)
Date:  Jun 28 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): (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 user on a multi-vCPU x86 PV guest system can invoke certain PV MMU operations to preempt the current vCPU and prevent use of a physical CPU, causing denial of service conditions on the host system.

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 denial of service conditions on the host system.
Solution:   The vendor has issued a fix (xsa264-4.10.patch and xsa264.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-264.html

Vendor URL:  xenbits.xen.org/xsa/advisory-264.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


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