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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen VMFUNC Emulation Bug Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1037518
SecurityTracker URL:  http://securitytracker.com/id/1037518
CVE Reference:   CVE-2016-10025   (Links to External Site)
Date:  Dec 21 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.6.x, 4.7.x, 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 trigger a null pointer validation error in the VMX VMFUNC emulation code and cause the host system hypervisor to crfash.

HVM guests are affected.

x86 systems using SVM (AMD virtualisation extensions) instead of VMX (Intel virtualisation extensions) are affecrted.

AMD x86 systems are affected.

Intel systems are not affected.

ARM systems are not affected.

Jan Beulich of SUSE 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 (xsa203-4.7.patch, xsa203-4.8.patch, and xsa203.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-203.html

Vendor URL:  xenbits.xen.org/xsa/advisory-203.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any)

Message History:   None.


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