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4.2	$0-$5k	0.00

A vulnerability has been found in Linux Kernel (Operating System) (version now known) and classified as problematic. Affected by this vulnerability is the function mb86a20s_read_status of the file drivers/media/dvb-frontends/mb86a20s.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability.

The weakness was published 07/15/2016 by Mauro Carvalho Chehab and Colin Ian King (Patrick) as confirmed git commit (GIT Repository). It is possible to read the advisory at git.linuxtv.org. This vulnerability is known as CVE-2016-5400 since 06/10/2016. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. Responsible for the vulnerability is the following code:

val = mb86a20s_readreg(state, 0x0a) & 0xf;

The advisory points out:

Appling the mask 0x0f to the immediate return of the call to mb86a20s_readreg will always result in a positive value, meaning that the check of ret < 0 will never work. Instead, check for a -ve return value first, and then mask val with 0x0f.

The vulnerability scanner Nessus provides a plugin with the ID 92804 (Fedora 23 : kernel (2016-754e4768d8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196568 (Ubuntu Security Notification for Linux Vulnerabilities (USN-3070-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.linuxtv.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

val = mb86a20s_readreg(state, 0x0a);
(...)
val &= 0xf;

The vulnerability is also documented in the vulnerability database at Tenable (92804). Similar entry is available at 90656.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

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: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
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: Memory corruption
CWE: CWE-119
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: 92804
Nessus Name: Fedora 23 : kernel (2016-754e4768d8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53829
OpenVAS Name: Ubuntu Update for linux-snapdragon USN-3070-3
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.linuxtv.org

Timelineinfo

06/10/2016 🔍
07/15/2016 +35 days 🔍
07/15/2016 +0 days 🔍
07/20/2016 +5 days 🔍
07/25/2016 +5 days 🔍
07/25/2016 +0 days 🔍
08/06/2016 +12 days 🔍
08/09/2016 +3 days 🔍
09/09/2022 +2222 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2016-754e4768d8
Researcher: Mauro Carvalho Chehab, Colin Ian King (Patrick)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-5400 (🔍)
SecurityTracker: 1036432
SecurityFocus: 92104 - Linux Kernel CVE-2016-5400 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 07/25/2016 22:19
Updated: 09/09/2022 14:05
Changes: 07/25/2016 22:19 (75), 03/10/2019 07:35 (13), 09/09/2022 13:59 (4), 09/09/2022 14:05 (1)
Complete: 🔍
Cache ID: 18:730

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