What is CVE-2016-1922?

CVE-2016-1922 is a medium-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2016-12-29.

How severe is CVE-2016-1922?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Qemu

CVE-2016-1922

QEMU (aka Quick Emulator) built with the TPR optimization for 32-bit Windows guests support is vulnerable to a null pointer dereference flaw. It occurs while doing I/O port write operations via hmp interface. In that, 'current_cpu' remains null, which leads to the null pointer dereference. A user or process could use this flaw to crash the QEMU instance, resulting in DoS issue.

Published 2016-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.1% 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

Qemu
Debian Linux — versions 7.0, 8.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.openwall.com/lists/oss-security/2016/01/16/1 (mailing-list, Mailing List, Third Party Advisory)
security.gentoo.org/glsa/201604-01 (vendor-advisory, Third Party Advisory)
www.openwall.com/lists/oss-security/2016/01/16/6 (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2016/dsa-3469 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2016/dsa-3470 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2016/dsa-3471 (vendor-advisory, Third Party Advisory)
lists.gnu.org/archive/html/qemu-devel/2016-01/msg02812.html (Vendor Advisory, mailing-list, Patch)
www.securityfocus.com/bid/81058 (VDB Entry, Third Party Advisory, vdb-entry)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2016-1922?: CVE-2016-1922 is a medium-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2016-12-29.
How severe is CVE-2016-1922?: Medium severity. CVSS v3 base score is 5.5 out of 10.