CVE-2016-6259

MEDIUM

Xen <4.7.x - DoS

Title source: llm

Description

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.

References (6)

[Vendor Advisory] http://support.citrix.com/article/CTX214954

[Third Party Advisory] http://www.securityfocus.com/bid/92130

[Third Party Advisory] http://www.securitytracker.com/id/1036447

[Mailing List, Patch] http://xenbits.xen.org/xsa/advisory-183.html

[Mitigation, Patch] http://xenbits.xen.org/xsa/xsa183-4.6.patch

[Mitigation, Patch] http://xenbits.xen.org/xsa/xsa183-unstable.patch

Scores

CVSS v3 6.2

EPSS 0.0027

EPSS Percentile 49.8%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-20

Status draft

Affected Products (14)

xen/xen

xen/xen

xen/xen

xen/xen

xen/xen

xen/xen

xen/xen

xen/xen

citrix/xenserver

citrix/xenserver

citrix/xenserver

citrix/xenserver

citrix/xenserver

citrix/xenserver

Timeline

Published Aug 02, 2016

Tracked Since Feb 18, 2026