Linux Kernel up to 4.14 fs/ocfs2/aops.c e_cpos race condition

CVSS Meta Temp Score
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.14. It has been rated as problematic. This vulnerability affects unknown code of the file fs/ocfs2/aops.c. The manipulation of the argument e_cpos leads to race condition. This vulnerability is traded as CVE-2017-18224. An attack has to be approached locally. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.14 (Operating System) and classified as problematic. This issue affects an unknown function of the file fs/ocfs2/aops.c. The manipulation of the argument e_cpos with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product 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. Impacted is availability. The summary by CVE is:

In the Linux kernel before 4.15, fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode, which allows local users to cause a denial of service (BUG) by modifying a certain e_cpos field.

The bug was discovered 11/15/2017. The weakness was shared 03/12/2018 (Website). It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2017-18224 since 03/11/2018. Attacking locally is a requirement. The successful exploitation requires a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 116 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109518 (Debian DSA-4188-1 : linux - security update (Spectre)), 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 171731 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2018:3934-1)).

Upgrading to version 4.15 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109518), SecurityFocus (BID 103353†) and CERT Bund (WID-SEC-2022-0532). The entries VDB-111185, VDB-113696, VDB-113823 and VDB-114029 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Oracle Linux
  • Debian Linux
  • Open Source Linux Kernel
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle VM
  • NetApp FAS
  • Avaya Aura Communication Manager
  • Avaya Aura Session Manager
  • Avaya Aura Application Enablement Services
  • Avaya Aura System Manager
  • Avaya Aura Experience Portal
  • NetApp AFF

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.9

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 109518
Nessus Name: Debian DSA-4188-1 : linux - security update (Spectre)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 54612
OpenVAS Name: Debian Security Advisory DSA 4188-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Kernel 4.15
Patch: git.kernel.org

Timelineinfo

11/15/2017 🔍
03/11/2018 +116 days 🔍
03/11/2018 +0 days 🔍
03/12/2018 +1 days 🔍
03/12/2018 +0 days 🔍
05/01/2018 +50 days 🔍
05/02/2018 +1 days 🔍
09/14/2025 +2692 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 3e4c56d41eef5595035872a2ec5a483f42e8917f
Status: Confirmed

CVE: CVE-2017-18224 (🔍)
GCVE (CVE): GCVE-0-2017-18224
GCVE (VulDB): GCVE-100-114359

OVAL: 🔍

SecurityFocus: 103353
CERT Bund: WID-SEC-2022-0532 - Linux Kernel: Mehrere Schwachstellen

See also: 🔍

Entryinfo

Created: 03/12/2018 07:56
Updated: 09/14/2025 02:02
Changes: 03/12/2018 07:56 (79), 01/12/2020 13:12 (2), 02/21/2023 09:35 (5), 09/14/2025 02:02 (22)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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