What is CVE-2016-9932?

CVE-2016-9932 is a low-severity vulnerability in Xen, classified under Information Disclosure. CVSS score: 3.3/10. Published 2017-01-26.

How severe is CVE-2016-9932?

Low severity. CVSS v3 base score is 3.3 out of 10.

Information disclosure in Xen

CVE-2016-9932

CMPXCHG8B emulation in Xen 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a "supposedly-ignored" operand size prefix.

Vulnerability class: Information Disclosure

Published 2017-01-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Xen — versions 3.3.0, 3.3.1, 3.3.2

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

xenbits.xen.org/xsa/advisory-200.html (Patch, Vendor Advisory)
security.gentoo.org/glsa/201612-56 (vendor-advisory)
www.debian.org/security/2017/dsa-3847 (vendor-advisory)
www.securitytracker.com/id/1037468 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/94863 (VDB Entry, Third Party Advisory, vdb-entry)
support.citrix.com/article/CTX219378 (Vendor Advisory)

Frequently asked questions

What is CVE-2016-9932?: CVE-2016-9932 is a low-severity vulnerability in Xen, classified under Information Disclosure. CVSS score: 3.3/10. Published 2017-01-26.
How severe is CVE-2016-9932?: Low severity. CVSS v3 base score is 3.3 out of 10.