HOMEVULNERABILITIESCVE-2016-9381
HIGH

CVE-2016-9381

CWE-362Published: January 23, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.

NVD Source

Technical Analysis

CVE-2016-9381 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.High
User InteractionNone
ScopeChanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Vendors & Products

citrix1 product(s)
xenserver
qemu1 product(s)
qemu
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.securityfocus.com/bid/94476
ADVISORYhttp://www.securitytracker.com/id/1037344
ADVISORYhttp://xenbits.xen.org/xsa/advisory-197.html
ADVISORYhttps://security.gentoo.org/glsa/201612-56
ADVISORYhttps://support.citrix.com/article/CTX218775
ADVISORYhttp://www.securityfocus.com/bid/94476
ADVISORYhttp://www.securitytracker.com/id/1037344
ADVISORYhttp://xenbits.xen.org/xsa/advisory-197.html
ADVISORYhttps://security.gentoo.org/glsa/201612-56
ADVISORYhttps://support.citrix.com/article/CTX218775

All References (10)

→
http://www.securityfocus.com/bid/94476Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1037344Third Party Advisory · VDB Entry
→
http://xenbits.xen.org/xsa/advisory-197.htmlThird Party Advisory
→
https://security.gentoo.org/glsa/201612-56Third Party Advisory
→
https://support.citrix.com/article/CTX218775Third Party Advisory
→
http://www.securityfocus.com/bid/94476Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1037344Third Party Advisory · VDB Entry
→
http://xenbits.xen.org/xsa/advisory-197.htmlThird Party Advisory
→
https://security.gentoo.org/glsa/201612-56Third Party Advisory
→
https://support.citrix.com/article/CTX218775Third Party Advisory

Quick Facts

CVE IDCVE-2016-9381
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-362
CISA KEVNo
Affected2 vendor(s)
PublishedJan 23, 2017

Related CVEs (CWE-362)

CVE-2015-8556
10.0
CVE-2014-0703
10.0
CVE-2010-1228
10.0
CVE-2008-6598
10.0
CVE-2020-1660
9.9
CVE-2024-48069
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-9381 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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