Vulnerability in Qemu
CVE-2016-9921
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% 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 — versions 2.8.0
- Debian Linux — versions 8.0
- Red Hat Enterprise Linux — versions 7.0
- Red Hat OpenStack — versions 6.0, 7.0, 8
- Red Hat Virtualization — versions 4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.debian.org/debian-lts-announce/2018/09/msg00007.html (mailing-list, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2017:2392 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/201701-49 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/94803 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2017:2408 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2016/12/09/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-9921?
- CVE-2016-9921 is a medium-severity vulnerability in Qemu, classified under Divide By Zero. CVSS score: 6.5/10. Published 2016-12-23.
- How severe is CVE-2016-9921?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2016-9921 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.