CVE-2016-6833

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-12-10 · updated 2026-06-17
Weakness: CWE-416

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.

Affected products

Debian Linux: 8.0
QEMU: through 2.6.2; 2.7.0-rc0, 2.7.0-rc1, 2.7.0-rc2

References

http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=6c352ca9b4ee3e1e286ea9e8434bd8e69ac7d0d8
http://www.openwall.com/lists/oss-security/2016/08/12/1
http://www.openwall.com/lists/oss-security/2016/08/18/3
http://www.securityfocus.com/bid/93255
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg01602.html
https://security.gentoo.org/glsa/201609-01
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=6c352ca9b4ee3e1e286ea9e8434bd8e69ac7d0d8
http://www.openwall.com/lists/oss-security/2016/08/12/1
http://www.openwall.com/lists/oss-security/2016/08/18/3
http://www.securityfocus.com/bid/93255
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html

Get alerted when CVE-2016-6833 or the next vulnerability affects your stack