Linux Kernel up to 4.4.1 visor.c clie_5_attach null pointer dereference

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CTI Interest Score
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A vulnerability, which was classified as critical, was found in Linux Kernel up to 4.4.1 (Operating System). Affected is the function clie_5_attach of the file drivers/usb/serial/visor.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. CVE summarizes:

The clie_5_attach function in drivers/usb/serial/visor.c in the Linux kernel through 4.4.1 allows physically proximate attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by inserting a USB device that lacks a bulk-out endpoint.

The weakness was released 02/08/2016 by Ralf Spenneberg with RCE Security (Website). The advisory is shared for download at This vulnerability is traded as CVE-2015-7566 since 09/29/2015. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known.

A public exploit has been developed by OpenSource Security and been published 2 months after the advisory. The exploit is shared for download at It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 87995 (Debian DSA-3448-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168771 (SUSE Enterprise Linux Security update for the Linux Kernel (SUSE-SU-2016:1203-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (39540), Tenable (87995), SecurityFocus (BID 82975†) and Vulnerability Center (SBV-56444†).







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.8

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: OpenSource Security
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Nessus ID: 87995
Nessus Name: Debian DSA-3448-1 : linux - security update
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OpenVAS ID: 703448
OpenVAS Name: Debian Security Advisory DSA 3448-1 (linux - security update)
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Threat Intelligenceinfo

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Recommended: Upgrade
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09/29/2015 🔍
01/18/2016 +112 days 🔍
01/19/2016 +1 days 🔍
01/19/2016 +0 days 🔍
02/06/2016 +18 days 🔍
02/07/2016 +0 days 🔍
02/08/2016 +1 days 🔍
02/08/2016 +0 days 🔍
02/08/2016 +0 days 🔍
03/08/2016 +29 days 🔍
03/08/2016 +0 days 🔍
07/07/2022 +2311 days 🔍



Advisory: USN-2929-1
Researcher: Ralf Spenneberg
Organization: RCE Security
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7566 (🔍)

SecurityFocus: 82975 - Linux Kernel 'drivers/usb/serial/visor.c' Local Denial of Service Vulnerability
Vulnerability Center: 56444 - Linux Kernel 4.4.1 and Earlier Local DoS and Other Unspecified Impact via a USB Device that Lacks a Bulk-Out Endpoint, Medium

scip Labs:


Created: 02/08/2016 09:04 AM
Updated: 07/07/2022 07:38 AM
Changes: 02/08/2016 09:04 AM (71), 08/22/2018 09:40 AM (25), 07/07/2022 07:38 AM (4)
Complete: 🔍
Cache ID: 35:E0B:40


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