Linux Kernel up to 4.13.1 fs/xfs/xfs_linux.h XFS_IS_REALTIME_INODE null pointer dereference

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CTI Interest Score
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A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.13.1 (Operating System). This issue affects the function XFS_IS_REALTIME_INODE of the file fs/xfs/xfs_linux.h. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability.

The bug was discovered 12/22/2017. The weakness was presented 09/15/2017 as confirmed git commit (GIT Repository). The advisory is shared at The identification of this vulnerability is CVE-2017-14340 since 09/12/2017. An attack has to be approached locally. A simple authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 103363 (Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)), 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 176163 (Debian Security Update for Linux (DSA 3981-1)).

Upgrading to version 4.13.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (103363). See 105390, 105605, 106083 and 106127 for similar entries.







CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
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NVD Base Score: 5.5
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Nessus ID: 103363
Nessus Name: Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)
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OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3981-1 (linux - security update)
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Threat Intelligenceinfo

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Recommended: Patch
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Upgrade: Kernel 4.13.2


09/12/2017 🔍
09/13/2017 +1 days 🔍
09/15/2017 +2 days 🔍
09/15/2017 +0 days 🔍
09/16/2017 +1 days 🔍
09/20/2017 +4 days 🔍
09/21/2017 +1 days 🔍
12/22/2017 +92 days 🔍
12/29/2022 +1833 days 🔍



Advisory: RHSA-2017:2918
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-14340 (🔍)

SecurityFocus: 100851 - Linux Kernel CVE-2017-14340 Local Denial of Service Vulnerability

See also: 🔍


Created: 09/16/2017 02:08 PM
Updated: 12/29/2022 09:32 AM
Changes: 09/16/2017 02:08 PM (81), 11/17/2019 08:07 AM (5), 12/29/2022 09:32 AM (4)
Complete: 🔍


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