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CVE-2016-9932

12
FAUCET Score

CVE-2016-9932 describes an information disclosure vulnerability in Xen versions 3.3.x through 4.7.x on x86 systems. A local HVM guest OS user can exploit a flaw in CMPXCHG8B emulation, specifically an ignored operand size prefix, to obtain sensitive information from the host's stack memory. This vulnerability has a CVSSv3 score of 3.3 (LOW), indicating a low attack complexity and requiring local access with low privileges to achieve a low impact on confidentiality. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.3.0CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.3.0:*:*:*:*:*:*:*
3.3.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.3.1:*:*:*:*:*:*:*
3.3.2CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.3.2:*:*:*:*:*:*:*
3.4.0CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.4.0:*:*:*:*:*:*:*
3.4.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.4.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

3.3LOW

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 91st percentile among its peer group of 1,509 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (2)

citrixvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen

Vendor Advisories (1)

redhatCVE-2016-9932Moderate

xen: x86 CMPXCHG8B emulation fails to ignore operand size override (XSA-200)

Dec 13, 2016

References

security.gentoo.org / glsa/201612-56
support.citrix.com / article/CTX219378
Vendor Advisory
debian.org / security/2017/dsa-3847
securityfocus.com / bid/94863
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037468
Third Party AdvisoryVDB Entry
xenbits.xen.org / xsa/advisory-200.html
PatchVendor Advisory