VDB-93847 · CVE-2016-9083 · BID 93929

Linux Kernel up to 4.8.11 vfio_pci.c integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability has been found in Linux Kernel up to 4.8.11 (Operating System) and classified as critical. Affected by this vulnerability is an unknown code block of the file drivers/vfio/pci/vfio_pci.c. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

drivers/vfio/pci/vfio_pci.c in the Linux kernel through 4.8.11 allows local users to bypass integer overflow checks, and cause a denial of service (memory corruption) or have unspecified other impact, by leveraging access to a vfio PCI device file for a VFIO_DEVICE_SET_IRQS ioctl call, aka a "state machine confusion bug."

The bug was discovered 10/26/2016. The weakness was disclosed 11/28/2016 by Vlad Tsyrklevich (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2016-9083 since 10/27/2016. The exploitation appears to be easy. Attacking locally is a requirement. The requirement for exploitation is a single authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 32 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 95702 (openSUSE Security Update : the Linux Kernel (openSUSE-2016-1428)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276227 (Fedora Security Update for kernel (FEDORA-2016-ee3a114958)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (95702). The entries 93467, 93468, 93490 and 93842 are pretty similar.







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
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NVD Base Score: 7.8
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Class: Integer overflow
CWE: CWE-190 / CWE-189
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Nessus ID: 95702
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2016-1428)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 855579
OpenVAS Name: Fedora Update for kernel FEDORA-2016-96d276367e
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Qualys ID: 🔍
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Threat Intelligenceinfo

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Recommended: Upgrade
Status: 🔍

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Patch: git.kernel.org


10/26/2016 🔍
10/26/2016 +0 days 🔍
10/27/2016 +1 days 🔍
11/27/2016 +31 days 🔍
11/28/2016 +1 days 🔍
11/28/2016 +0 days 🔍
12/08/2016 +10 days 🔍
12/12/2016 +4 days 🔍
10/04/2022 +2122 days 🔍


Vendor: kernel.org

Advisory: 05692d7005a364add85c6e25a6c4447ce08f913a
Researcher: Vlad Tsyrklevich
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9083 (🔍)
SecurityFocus: 93929 - Linux Kernel CVE-2016-9083 Local Integer Overflow Vulnerability

See also: 🔍


Created: 11/28/2016 09:31 AM
Updated: 10/04/2022 02:56 PM
Changes: 11/28/2016 09:31 AM (67), 06/11/2019 10:20 AM (16), 10/04/2022 02:54 PM (4), 10/04/2022 02:56 PM (1)
Complete: 🔍


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