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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen VMID Resource Exhaustion Bug Lets Local Domain Drivers Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1036035
SecurityTracker URL:  http://securitytracker.com/id/1036035
CVE Reference:   CVE-2016-5242   (Links to External Site)
Updated:  Jun 6 2016
Original Entry Date:  Jun 3 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 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 user with control of a less-privileged device domain driver can hold a reference to a domain to prevent the domain's Virtual Machine Identifier (VMID) from being released. This can be repeated to consume all available VMIDs and cause the host system to crash.

arm systems are affected.

x86 systems are not affected.

Aaron Cornelius of DornerWorks reported this vulnerability.

Impact:   A local user with control of a less-privileged device domain driver can cause the host system to crash.
Solution:   The vendor has issued a fix (xsa181.patch, xsa181-4.4.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-181.html

Vendor URL:  xenbits.xen.org/xsa/advisory-181.html (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any)

Message History:   None.


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