CVE-2016-6834

NameCVE-2016-6834
DescriptionThe net_tx_pkt_do_sw_fragmentation function in hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via a zero length for the current fragment length.
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 Bugs834905

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+deb7u23fixed
jessie (security), jessie1:2.1+dfsg-12+deb8u6vulnerable
stretch1:2.8+dfsg-6fixed
stretch (security)1:2.8+dfsg-6+deb9u2fixed
buster, sid1:2.8+dfsg-7fixed
qemu-kvm (PTS)wheezy1.1.2+dfsg-6+deb7u12fixed
wheezy (security)1.1.2+dfsg-6+deb7u23fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusource(unstable)1:2.6+dfsg-3.1low834905
qemusourcewheezy(not affected)
qemu-kvmsource(unstable)(unfixed)low
qemu-kvmsourcewheezy(not affected)

Notes

[jessie] - qemu <no-dsa> (Minor issue)
[wheezy] - qemu <not-affected> (Vulnerable code not present, packet abstraction introduced in 1.5)
[wheezy] - qemu-kvm <not-affected> (Vulnerable code not present, packet abstraction introduced in 1.5)
http://git.qemu.org/?p=qemu.git;a=commit;h=ead315e43ea0c2ca3491209c6c8db8ce3f2bbe05
Upstream patch: https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg01601.html
http://www.openwall.com/lists/oss-security/2016/08/11/8

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