What’s Vulnerable › Vulnerabilities

CVE-2016-9386

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-01-23 · updated 2026-06-17
• Weakness: CWE-264

Description

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Affected products

• Citrix XenServer: 6.0.2, 6.2.0, 6.5, 7.0
• xen: all versions

References

• http://www.securityfocus.com/bid/94471
• http://www.securitytracker.com/id/1037340
• http://xenbits.xen.org/xsa/advisory-191.html
• https://security.gentoo.org/glsa/201612-56
• https://support.citrix.com/article/CTX218775
• http://www.securityfocus.com/bid/94471
• http://www.securitytracker.com/id/1037340
• http://xenbits.xen.org/xsa/advisory-191.html
• https://security.gentoo.org/glsa/201612-56
• https://support.citrix.com/article/CTX218775

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