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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen P2M Lock Starvation Flaw Lets Local Guest Administrative Users Deny Service on the Host System
SecurityTracker Alert ID:  1031353
SecurityTracker URL:  http://securitytracker.com/id/1031353
CVE Reference:   CVE-2014-9065, CVE-2014-9066   (Links to External Site)
Date:  Dec 11 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2 and after
Description:   A vulnerability was reported in Xen. A local guest administrative user can cause denial of service conditions on the host system.

A local guest administrative user can trigger a flaw in the physical to machine (P2M) mapping read/write lock implementation by issuing a flow of read lock acquires to prevent some write calls from acquiring a lock. On systems with the NMI watchdog active, a resulting timeout may cause the host to crash.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local guest administrative user can cause the host system to crash.
Solution:   The vendor has issued a fix (xsa114.patch, xsa114-4.2.patch, xsa114-4.3.patch, xsa114-4.4.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-114.html

Vendor URL:  xenbits.xen.org/xsa/advisory-114.html (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any)

Message History:   None.


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