CVE-2016-6888: Integer Overflow
First published: Mon Aug 22 2016(Updated: )
Integer overflow in the net_tx_pkt_init function in hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (QEMU process crash) via the maximum fragmentation count, which triggers an unchecked multiplication and NULL pointer dereference.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU | <=2.6.2 | |
| QEMU | =2.7.0-rc0 | |
| QEMU | =2.7.0-rc1 | |
| QEMU | =2.7.0-rc2 | |
| QEMU | =2.7.0-rc3 | |
| Debian Linux | =8.0 | |
| Red Hat Enterprise Virtualization | =4.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat OpenStack for IBM Power | =6.0 | |
| Red Hat OpenStack for IBM Power | =7.0 | |
| Red Hat OpenStack for IBM Power | =8 | |
| Red Hat OpenStack for IBM Power | =9 | |
| Red Hat OpenStack for IBM Power | =10 | |
| Red Hat OpenStack for IBM Power | =11 |
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Reference Links
- http://git.qemu.org/?p=qemu.git;a=commit;h=47882fa4975bf0b58dd74474329fdd7154e8f04c
- http://www.openwall.com/lists/oss-security/2016/08/19/10
- http://www.openwall.com/lists/oss-security/2016/08/19/6
- http://www.securityfocus.com/bid/92556
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03176.html
- https://security.gentoo.org/glsa/201609-01
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1369032
- https://bugzilla.redhat.com/show_bug.cgi?id=1369031
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=47882fa4975bf0b58dd74474329fdd7154e8f04c
Frequently Asked Questions
What is the severity of CVE-2016-6888?
The severity of CVE-2016-6888 is classified as medium, as it can lead to a denial of service by crashing the QEMU process.
How do I fix CVE-2016-6888?
To fix CVE-2016-6888, update QEMU to version 2.7.0 or later, or apply any available patches provided by your distribution.
Which versions of QEMU are affected by CVE-2016-6888?
CVE-2016-6888 affects QEMU versions up to 2.6.2 and the 2.7.0 release candidates.
Can CVE-2016-6888 be exploited remotely?
CVE-2016-6888 cannot be exploited remotely as it requires local guest OS administrator access.
What is the impact of CVE-2016-6888?
The impact of CVE-2016-6888 is a denial of service, causing the QEMU process to crash due to an integer overflow.
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