Linux Kernel up to 4.4.1 drivers/tty/tty_io.c tty_ioctl race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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). This affects the function tty_ioctl of the file drivers/tty/tty_io.c. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 02/08/2016 with Red Hat (Website). The advisory is shared at This vulnerability is uniquely identified as CVE-2016-0723 since 12/15/2015. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

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 196465 (Ubuntu Security Notification for Linux Vulnerabilities (USN-2967-1)).

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 vulnerability database at Tenable (87995). Similar entries are available at 78542, 80792, 80796 and 80803.






  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
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NVD Base Score: 6.8
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Class: Race condition
CWE: CWE-362
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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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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12/15/2015 🔍
01/18/2016 +34 days 🔍
01/19/2016 +1 days 🔍
01/19/2016 +0 days 🔍
02/07/2016 +18 days 🔍
02/07/2016 +0 days 🔍
02/08/2016 +0 days 🔍
02/08/2016 +0 days 🔍
02/08/2016 +0 days 🔍
07/07/2022 +2340 days 🔍



Advisory: USN-2929-1
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-0723 (🔍)

SecurityTracker: 1035695
Vulnerability Center: 56434 - Linux Kernel 4.4.1 and Earlier Local Information Disclosure or DoS due to a Race Condition in the tty_ioctl Function, Medium
SecurityFocus: 82950 - Linux Kernel CVE-2016-0723 Local Race Condition Vulnerability

See also: 🔍


Created: 02/08/2016 09:05 AM
Updated: 07/07/2022 08:12 AM
Changes: 02/08/2016 09:05 AM (72), 08/21/2018 08:49 AM (16), 07/07/2022 08:12 AM (5)
Complete: 🔍


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