CVE-2016-6259

moderate-risk
Published 2016-08-02

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.

Do I need to act?

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0.27% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.2/10 Medium
LOCAL / LOW complexity

Affected Products (14)

Xen
Xen
Xen
Xen
Xen
Xen
Xen
Xen

Affected Vendors

Xen Citrix

References (12)

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 http://xenbits.xen.org/xsa/advisory-183.html
Mitigation http://xenbits.xen.org/xsa/xsa183-4.6.patch
Mitigation http://xenbits.xen.org/xsa/xsa183-unstable.patch
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 http://xenbits.xen.org/xsa/advisory-183.html
Mitigation http://xenbits.xen.org/xsa/xsa183-4.6.patch
Mitigation http://xenbits.xen.org/xsa/xsa183-unstable.patch
39
/ 100
moderate-risk
Severity 20/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 18/34 · Moderate