CVE-2016-6259

Severity: medium (CVSS 6.2 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-08-02 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Citrix XenServer: 6.0, 6.0.2, 6.1, 6.2.0-sp1, 6.5.0-sp1, 7.0
xen: 4.5.0, 4.5.1, 4.5.2, 4.5.3, 4.6.0, 4.6.1 (+2)

References

http://support.citrix.com/article/CTX214954
http://www.securityfocus.com/bid/92130
http://www.securitytracker.com/id/1036447
http://xenbits.xen.org/xsa/advisory-183.html
http://xenbits.xen.org/xsa/xsa183-4.6.patch
http://xenbits.xen.org/xsa/xsa183-unstable.patch
http://support.citrix.com/article/CTX214954
http://www.securityfocus.com/bid/92130
http://www.securitytracker.com/id/1036447
http://xenbits.xen.org/xsa/advisory-183.html
http://xenbits.xen.org/xsa/xsa183-4.6.patch
http://xenbits.xen.org/xsa/xsa183-unstable.patch

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