CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

A vulnerability was found in Linux Kernel up to 4.8.6 (Operating System). It has been rated as critical. Affected by this issue is the function x86_decode_insn of the file arch/x86/kvm/emulate.c of the component KVM. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is availability. CVE summarizes:

The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M byte in an undefined instruction.

The bug was discovered 12/09/2016. The weakness was disclosed 11/28/2016 (Website). The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2016-8630 since 10/12/2016. The exploitation is known to be easy. Local access is required to approach this attack. The successful exploitation requires a simple authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 95995 (Ubuntu 16.04 LTS : linux vulnerabilities (USN-3161-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu 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 to version 4.8.7 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (95995).

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.8.0
• 4.8.1
• 4.8.2
• 4.8.3
• 4.8.4
• 4.8.5
• 4.8.6

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 95995
Nessus Name: Ubuntu 16.04 LTS : linux vulnerabilities (USN-3161-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 860758
OpenVAS Name: Ubuntu Update for linux-lts-xenial USN-3161-2
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: Kernel 4.8.7
Patch: git.kernel.org

Timelineinfo

10/12/2016 🔍
11/22/2016 +41 days 🔍
11/27/2016 +5 days 🔍
11/28/2016 +1 days 🔍
11/28/2016 +0 days 🔍
12/09/2016 +11 days 🔍
12/20/2016 +11 days 🔍
12/21/2016 +1 days 🔍
10/04/2022 +2113 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3161-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-8630 (🔍)
SecurityFocus: 94459 - Linux Kernel 'kvm/emulate.c' Null Pointer Dereference Denial of Service Vulnerability

Entryinfo

Created: 11/28/2016 09:31
Updated: 10/04/2022 14:34
Changes: 11/28/2016 09:31 (71), 06/11/2019 09:51 (14), 10/04/2022 14:28 (5), 10/04/2022 14:31 (1), 10/04/2022 14:34 (1)
Complete: 🔍
Cache ID: 3:E02:103

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