Description
Xen 4.0.x through 4.7.x mishandle x86 task switches to VM86 mode, which allows local 32-bit x86 HVM guest OS users to gain privileges or cause a denial of service (guest OS crash) by leveraging a guest operating system that uses hardware task switching and allows a new task to start in VM86 mode.
References (5)
Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/94470
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201612-56
Patch, Vendor Advisory x_refsource_confirm
http://xenbits.xen.org/xsa/advisory-192.html
Third Party Advisory, VDB Entry vdb-entry
x_refsource_sectrack
http://www.securitytracker.com/id/1037341
Patch, Third Party Advisory x_refsource_confirm
https://support.citrix.com/article/CTX218775
Scores
CVSS v3
7.8
EPSS
0.0012
EPSS Percentile
31.0%
Attack Vector
LOCAL
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-264
Status
published
Products (43)
citrix/xenserver
6.0.2
citrix/xenserver
6.2.0
citrix/xenserver
6.5
citrix/xenserver
7.0
xen/xen
4.0.0
xen/xen
4.0.1
xen/xen
4.0.2
xen/xen
4.0.3
xen/xen
4.0.4
xen/xen
4.1.0
... and 33 more
Published
Jan 23, 2017
Tracked Since
Feb 18, 2026