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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen x86 Null Segment Access Control Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1037340
SecurityTracker URL:
CVE Reference:   CVE-2016-9386   (Links to External Site)
Date:  Nov 24 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the guest system.

A local unprivileged user on the guest system can exploit a flaw in the x86 emulator in controlling access to null user data segments to gain elevated privileges on the guest system.

HVM guests are affected

ARM systems are not affected.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the guest system.
Solution:   The vendor has issued a fix (xsa191-4.6.patch, xsa191.patch).

The vendor advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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