CVE-2016-9921
Summary
| CVE | CVE-2016-9921 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2016-12-23 22:59:00 UTC |
| Updated | 2026-05-06 22:30:45 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS: 0.001040000 probability, percentile 0.278380000 (date 2026-05-11)
Problem Types: CWE-369 | n/a
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
| 2.0 | [email protected] | Primary | 2.1 | AV:L/AC:L/Au:N/C:N/I:N/A:P |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS v2.0 Breakdown
Access Vector
LocalAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
PartialAV:L/AC:L/Au:N/C:N/I:N/A:P
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Debian | Debian Linux | 8.0 | All | All | All |
| Application | Qemu | Qemu | 2.8.0 | rc0 | All | All |
| Application | Qemu | Qemu | 2.8.0 | rc1 | All | All |
| Application | Qemu | Qemu | 2.8.0 | rc2 | All | All |
| Application | Qemu | Qemu | All | All | All | All |
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Application | Redhat | Openstack | 10 | All | All | All |
| Application | Redhat | Openstack | 11 | All | All | All |
| Application | Redhat | Openstack | 6.0 | All | All | All |
| Application | Redhat | Openstack | 7.0 | All | All | All |
| Application | Redhat | Openstack | 8 | All | All | All |
| Application | Redhat | Openstack | 9 | All | All | All |
| Application | Redhat | Virtualization | 4.0 | All | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| QEMU Divide By Zero Multiple Denial of Service Vulnerabilities | af854a3a-2127-422b-91ae-364da2661108 | www.securityfocus.com | Third Party Advisory, VDB Entry |
| oss-security - Re: CVE request Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Patch, Third Party Advisory |
| QEMU: Multiple vulnerabilities (GLSA 201701-49) — Gentoo security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | Third Party Advisory |
| [SECURITY] [DLA 1497-1] qemu security update | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List, Third Party Advisory |
| Red Hat Customer Portal | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| Red Hat Customer Portal | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| CVE-2016-9921 - Red Hat Customer Portal | MITRE | access.redhat.com | |
| Bug 1334398 – CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy | MITRE | bugzilla.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 710389 Gentoo Linux QEMU Multiple Vulnerabilities (GLSA 201701-49)