CVE-2016-6259

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.

• CWE-20

• http://support.citrix.com/article/CTX214954Vendor Advisory
• http://www.securityfocus.com/bid/92130Third Party Advisory
• http://www.securitytracker.com/id/1036447Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-183.htmlMailing List, Patch
• http://xenbits.xen.org/xsa/xsa183-4.6.patchMitigation, Patch
• http://xenbits.xen.org/xsa/xsa183-unstable.patchMitigation, Patch
• http://support.citrix.com/article/CTX214954Vendor Advisory
• http://www.securityfocus.com/bid/92130Third Party Advisory
• http://www.securitytracker.com/id/1036447Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-183.htmlMailing List, Patch
• http://xenbits.xen.org/xsa/xsa183-4.6.patchMitigation, Patch
• http://xenbits.xen.org/xsa/xsa183-unstable.patchMitigation, Patch

Published

Aug 2, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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