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.
6.8	$0-$5k	0.00

A vulnerability, which was classified as critical, was found in Linux Kernel (Operating System) (unknown version). Affected is the function snd_seq_ioctl_remove_events of the file sound/core/seq/seq_clientmgr.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 03/15/2016 as Bug 1311554 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2016-2543 since 02/23/2016. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The reason for this vulnerability is this part of code:

if (client->type == USER_CLIENT)

The vulnerability scanner Nessus provides a plugin with the ID 89933 (Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2929-2)), 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 157744 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2018-4145)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published before and not just after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if (client->type == USER_CLIENT && client->data.user.fifo)

The vulnerability is also documented in the databases at X-Force (111569), Tenable (89933) and SecurityFocus (BID 83377†). See VDB-80982, VDB-82955, VDB-82956 and VDB-82958 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.8

VulDB Base Score: 8.4
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.2
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: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 89933
Nessus Name: Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2929-2)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 865386
OpenVAS Name: Ubuntu Update for linux-lts-trusty USN-2929-2
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

02/22/2016 🔍
02/23/2016 +0 days 🔍
03/13/2016 +19 days 🔍
03/14/2016 +1 days 🔍
03/15/2016 +0 days 🔍
03/23/2016 +8 days 🔍
04/27/2016 +35 days 🔍
07/10/2022 +2265 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Bug 1311554
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2543 (🔍)
GCVE (CVE): GCVE-0-2016-2543
GCVE (VulDB): GCVE-100-81408

OVAL: 🔍

X-Force: 111569 - Linux Kernel snd_seq_ioctl_remove_events() denial of service
SecurityFocus: 83377 - Linux Kernel CVE-2016-2543 Null Pointer Deference Local Denial of Service Vulnerability
SecurityTracker: 1035304

See also: 🔍

Entryinfo

Created: 03/23/2016 11:54 AM
Updated: 07/10/2022 03:35 PM
Changes: 03/23/2016 11:54 AM (66), 09/21/2018 08:49 AM (20), 07/10/2022 03:35 PM (4)
Complete: 🔍
Cache ID: 18:BC1:40

Discussion

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