CVE-2016-9921
Qemu Cirrus VGA Divide By Zero Vulnerability
Description
Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS.
INFO
Published Date :
Dec. 23, 2016, 10:59 p.m.
Last Modified :
Feb. 13, 2023, 4:50 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.0
Affected Products
The following products are affected by CVE-2016-9921
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2016-9921.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2016/12/09/1 | Mailing List Patch Third Party Advisory |
| http://www.securityfocus.com/bid/94803 | Third Party Advisory VDB Entry |
| https://access.redhat.com/errata/RHSA-2017:2392 | Third Party Advisory |
| https://access.redhat.com/errata/RHSA-2017:2408 | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html | Mailing List Third Party Advisory |
| https://security.gentoo.org/glsa/201701-49 | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2016-9921 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2016-9921 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Feb. 13, 2023
Action Type Old Value New Value Changed Description CVE-2016-9921 CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS. Removed CVSS V2 Red Hat, Inc. (AV:A/AC:M/Au:S/C:N/I:N/A:P) Removed CVSS V3 Red Hat, Inc. AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L Removed Reference https://access.redhat.com/security/cve/CVE-2016-9921 [No Types Assigned] Removed Reference https://bugzilla.redhat.com/show_bug.cgi?id=1334398 [No Types Assigned] -
CVE Modified by [email protected]
Feb. 02, 2023
Action Type Old Value New Value Changed Description Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS. CVE-2016-9921 CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy Added CVSS V2 Red Hat, Inc. (AV:A/AC:M/Au:S/C:N/I:N/A:P) Added CVSS V3 Red Hat, Inc. AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=1334398 [No Types Assigned] Added Reference https://access.redhat.com/security/cve/CVE-2016-9921 [No Types Assigned] -
CPE Deprecation Remap by [email protected]
Aug. 04, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:redhat:openstack:9.0:*:*:*:*:*:*:* OR *cpe:2.3:a:redhat:openstack:9:*:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
Aug. 04, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:redhat:openstack:8.0:*:*:*:*:*:*:* OR *cpe:2.3:a:redhat:openstack:8:*:*:*:*:*:*:* -
Modified Analysis by [email protected]
Dec. 14, 2020
Action Type Old Value New Value Removed CVSS V3 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2016/12/09/1 Third Party Advisory http://www.openwall.com/lists/oss-security/2016/12/09/1 Mailing List, Patch, Third Party Advisory Changed Reference Type https://access.redhat.com/errata/RHSA-2017:2392 No Types Assigned https://access.redhat.com/errata/RHSA-2017:2392 Third Party Advisory Changed Reference Type https://access.redhat.com/errata/RHSA-2017:2408 No Types Assigned https://access.redhat.com/errata/RHSA-2017:2408 Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html No Types Assigned https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html Mailing List, Third Party Advisory Changed Reference Type https://security.gentoo.org/glsa/201701-49 No Types Assigned https://security.gentoo.org/glsa/201701-49 Third Party Advisory Changed CPE Configuration OR *cpe:2.3:a:qemu:qemu:-:*:*:*:*:*:*:* OR *cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions up to (including) 2.7.1 *cpe:2.3:a:qemu:qemu:2.8.0:rc0:*:*:*:*:*:* *cpe:2.3:a:qemu:qemu:2.8.0:rc1:*:*:*:*:*:* *cpe:2.3:a:qemu:qemu:2.8.0:rc2:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:a:redhat:openstack:6.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:7.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:8.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:9.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:11:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:* OR cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Sep. 07, 2018
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html [No Types Assigned] -
CVE Modified by [email protected]
Jan. 05, 2018
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2017:2408 [No Types Assigned] Added Reference https://access.redhat.com/errata/RHSA-2017:2392 [No Types Assigned] -
CVE Modified by [email protected]
Jul. 01, 2017
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/201701-49 [No Types Assigned] -
Initial Analysis by [email protected]
Dec. 27, 2016
Action Type Old Value New Value Added CVSS V2 (AV:L/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3 AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2016/12/09/1 No Types Assigned http://www.openwall.com/lists/oss-security/2016/12/09/1 Third Party Advisory Changed Reference Type http://www.securityfocus.com/bid/94803 No Types Assigned http://www.securityfocus.com/bid/94803 Third Party Advisory, VDB Entry Added CWE CWE-369 Added CPE Configuration OR *cpe:2.3:a:qemu:qemu:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2016-9921 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2016-9921
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.00%
score
0.24592
percentile