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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen P2M Page Free Flaw Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1037896
SecurityTracker URL:  http://securitytracker.com/id/1037896
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 23 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.8.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 the guest system can make a specially crafted XENMEM_decrease_reservation call to trigger a page free error in stage-2 page table management to corrupt hypervisor state. As a result, the host system may crash.

ARM systems are affected.

X86 based systems are not affected.

Vijay Kilari of Cavium and Julien Grall of ARM reported this vulnerability.

Impact:   A local user on the guest system can cause the host system to crash.
Solution:   The vendor has issued a fix (xsa210.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-210.txt

Vendor URL:  xenbits.xen.org/xsa/advisory-210.txt (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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