VDB-180367 · CVE-2021-38203 · Nessus 250241

Linux Kernel up to 5.13.3 btrfs space_info deadlock

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4.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.13.3. It has been classified as problematic. Affected by this vulnerability is the function space_info of the component btrfs. This manipulation causes deadlock. This vulnerability is tracked as CVE-2021-38203. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.13.3 (Operating System). It has been declared as problematic. Affected by this vulnerability is the function space_info of the component btrfs. The manipulation with an unknown input leads to a deadlock vulnerability. The CWE definition for the vulnerability is CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. As an impact it is known to affect availability.

The weakness was disclosed 08/09/2021 as 1cb3db1cf383a3c7dbda1aa0ce748b0958759947. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-38203. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 250241 (Linux Distros Unpatched Vulnerability : CVE-2021-38203), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.13.4 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (250241). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Deadlock
CWE: CWE-833 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 250241
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-38203

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.13.4
Patch: github.com

Timelineinfo

08/08/2021 🔍
08/09/2021 +1 days 🔍
08/09/2021 +0 days 🔍
08/16/2025 +1468 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 1cb3db1cf383a3c7dbda1aa0ce748b0958759947
Status: Confirmed

CVE: CVE-2021-38203 (🔍)
GCVE (CVE): GCVE-0-2021-38203
GCVE (VulDB): GCVE-100-180367

Entryinfo

Created: 08/09/2021 07:06
Updated: 08/16/2025 19:20
Changes: 08/09/2021 07:06 (44), 08/14/2021 09:57 (2), 08/14/2021 10:00 (18), 08/16/2025 19:20 (17)
Complete: 🔍
Cache ID: 216::103