Linux Kernel up to 4.3.2 epoll_ctl Call net/unix/af_unix.c use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical has been found in Linux Kernel up to 4.3.2 (Operating System). Affected is an unknown functionality of the file net/unix/af_unix.c of the component epoll_ctl Call Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability.

The weakness was published 12/28/2015 (Website). The advisory is shared for download at This vulnerability is traded as CVE-2013-7446 since 11/18/2015. 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 vulnerability scanner Nessus provides a plugin with the ID 88519 (Ubuntu 14.04 LTS : linux vulnerabilities (USN-2887-1)), 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 169069 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2016:2074-1)).

Upgrading to version 4.3.3 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (88519). Similar entries are available at 75137, 77323, 78716 and 79118.







CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍



VulDB Base Score: 🔍
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NVD Base Score: 🔍


Class: Use after free
CWE: CWE-416 / CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 88519
Nessus Name: Ubuntu 14.04 LTS : linux vulnerabilities (USN-2887-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703426
OpenVAS Name: Debian Security Advisory DSA 3426-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
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Exposure Time: 🔍

Upgrade: Kernel 4.3.3


09/10/2015 🔍
11/18/2015 +69 days 🔍
12/28/2015 +40 days 🔍
12/28/2015 +0 days 🔍
12/29/2015 +1 days 🔍
02/01/2016 +34 days 🔍
02/02/2016 +1 days 🔍
07/01/2022 +2341 days 🔍



Advisory: USN-2887-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2013-7446 (🔍)

SecurityTracker: 1034557
SecurityFocus: 77638 - Linux kernel CVE-2013-7446 Use After Free Denial of Service Vulnerability

See also: 🔍


Created: 12/29/2015 01:20 PM
Updated: 07/01/2022 02:55 PM
Changes: 12/29/2015 01:20 PM (57), 05/25/2018 10:11 AM (26), 07/01/2022 02:54 PM (6), 07/01/2022 02:55 PM (1)
Complete: 🔍


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