Linux Kernel OverlayFS Subsystem information disclosure

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel and classified as problematic. This vulnerability affects unknown code of the component OverlayFS Subsystem. Performing a manipulation results in information disclosure. This vulnerability is known as CVE-2021-3732. Remote exploitation of the attack is possible. No exploit is available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (the affected version unknown). It has been classified as problematic. This affects an unknown part of the component OverlayFS Subsystem. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality.

The weakness was published 03/10/2022. The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2021-3732 since 08/23/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 250178 (Linux Distros Unpatched Vulnerability : CVE-2021-3732), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (250178). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 250178
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-3732

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

08/23/2021 🔍
03/10/2022 +199 days 🔍
03/10/2022 +0 days 🔍
08/17/2025 +1256 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 427215d85e8d1476da1a86b8d67aceb485eb3631
Status: Confirmed

CVE: CVE-2021-3732 (🔍)
GCVE (CVE): GCVE-0-2021-3732
GCVE (VulDB): GCVE-100-194505

Entryinfo

Created: 03/10/2022 20:36
Updated: 08/17/2025 09:02
Changes: 03/10/2022 20:36 (39), 03/12/2022 12:25 (2), 03/12/2022 12:32 (1), 08/17/2025 09:02 (16)
Complete: 🔍
Cache ID: 216:FB9:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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