CVE-2016-6833

NameCVE-2016-6833
DescriptionUse-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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severitylow (attack range: local)
Debian Bugs834904

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)wheezy1.1.2+dfsg-6a+deb7u12fixed
wheezy (security)1.1.2+dfsg-6+deb7u22fixed
jessie (security), jessie1:2.1+dfsg-12+deb8u6vulnerable
buster, sid, stretch1:2.8+dfsg-6fixed
stretch (security)1:2.8+dfsg-6+deb9u1fixed
qemu-kvm (PTS)wheezy1.1.2+dfsg-6+deb7u12fixed
wheezy (security)1.1.2+dfsg-6+deb7u22fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusource(unstable)1:2.6+dfsg-3.1low834904
qemusourcewheezy(not affected)
qemu-kvmsource(unstable)(unfixed)low
qemu-kvmsourcewheezy(not affected)

Notes

[wheezy] - qemu <not-affected> (Vulnerable code not present, vmxnet3 introduced in 1.5)
[wheezy] - qemu-kvm <not-affected> (Vulnerable code not present, vmxnet3 introduced in 1.5)
http://git.qemu.org/?p=qemu.git;a=commit;h=6c352ca9b4ee3e1e286ea9e8434bd8e69ac7d0d8
Upstream patch: https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg01602.html
http://www.openwall.com/lists/oss-security/2016/08/12/1

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