Linux Kernel up to 4.8.11 vfio_pci_intrs.c kzalloc integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.8.11. It has been declared as problematic. The impacted element is the function kzalloc of the file drivers/vfio/pci/vfio_pci_intrs.c. Such manipulation leads to integer overflow. This vulnerability is listed as CVE-2016-9084. The attack must be carried out locally. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.8.11 (Operating System) and classified as critical. Affected by this issue is the function kzalloc of the file drivers/vfio/pci/vfio_pci_intrs.c. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

drivers/vfio/pci/vfio_pci_intrs.c in the Linux kernel through 4.8.11 misuses the kzalloc function, which allows local users to cause a denial of service (integer overflow) or have unspecified other impact by leveraging access to a vfio PCI device file.

The bug was discovered 10/26/2016. The weakness was presented 11/28/2016 by Vlad Tsyrklevich (Website). The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2016-9084 since 10/27/2016. The exploitation is known to be easy. The attack needs to be approached locally. Required for exploitation is a simple authentication. There are known technical details, but no exploit is available.

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 databases at Tenable (95702) and SecurityFocus (BID 93930†). See VDB-93467, VDB-93468, VDB-93490 and VDB-93842 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 95702
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2016-1428)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 855579
OpenVAS Name: Fedora Update for kernel FEDORA-2016-96d276367e
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

10/26/2016 🔍
10/27/2016 +1 days 🔍
10/27/2016 +0 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 🔍

Sourcesinfo

Vendor: kernel.org

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

CVE: CVE-2016-9084 (🔍)
GCVE (CVE): GCVE-0-2016-9084
GCVE (VulDB): GCVE-100-93848
SecurityFocus: 93930 - Linux Kernel Vfio Driver CVE-2016-9084 Integer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 11/28/2016 09:32
Updated: 10/04/2022 15:02
Changes: 11/28/2016 09:32 (69), 06/11/2019 10:27 (16), 10/04/2022 14:57 (4), 10/04/2022 15:02 (1)
Complete: 🔍
Cache ID: 216::103

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