CVE & CISA-KEV Catalog

CVE-2016-6833

MEDIUM

4.4

CVSS v3

Description

Use-after-free vulnerability in the vmxnet3_io_bar0_write function in hw/net/vmxnet3.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (QEMU instance crash) by leveraging failure to check if the device is active.

CWE-416Use After Free

How to fix

Remediation Available

qemuDebian

Fixed in:1:2.6+dfsg-3.1CVE-2016-6833

Fixed in:1:2.6+dfsg-3.1CVE-2016-6833

Fixed in:1:2.6+dfsg-3.1CVE-2016-6833

Fixed in:1:2.6+dfsg-3.1CVE-2016-6833

qemuUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-systemUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-aarch64Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-armUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-mipsUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-miscUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-ppcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-s390xUbuntu

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-sparcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

qemu-system-x86Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.30USN-3125-1

Fixed in:1:2.5+dfsg-5ubuntu10.6USN-3125-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Patch1

lists.gnu.org

Third-Party Advisory5

Other references1

git.qemu.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.