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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen x86 Memory Paging Flaw Lets Local Guest System Users Deny Service on the Host System
SecurityTracker Alert ID:  1030723
SecurityTracker URL:  http://securitytracker.com/id/1030723
CVE Reference:   CVE-2014-5146, CVE-2014-5149   (Links to External Site)
Date:  Aug 13 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on a guest system can cause denial of service conditions on the host system.

A local user on an HVM guest can invoke certain long latency MMU virtualization operations that cannot be preempted to consume excessive vcpu resources [CVE-2014-5146 on guests Hardware Assisted Paging (HAP), CVE-2014-5149 on guests that don't use HAP].

A guest that has a large allocation of shadow/p2m RAM in excess of 128 GB can exploit this flaw to deny service on the host system.

x86 versions are affected.

ARM systems are not vulnerable.

Jan Beulich reported this vulnerability.

Impact:   A local user on a guest system can cause denial of service conditions on the target host system.
Solution:   The vendor has issued a fix for guest systems using HAP (xsa97-hap-4.2-prereq.patch, xsa97-hap-4.2.patch, xsa97-hap-4.3.patch, xsa97-hap-4.4.patch, xsa97-hap-unstable.patch).

No solution for was available at the time of this entry for guest systems using shadow pagetables and not HAP.

Vendor URL:  www.xen.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


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