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CVE-2021-38203

5.5 · MEDIUM

btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of…

Published Aug 8, 2021CWE-667EPSS 0.36%

Overview

CVE-2021-38203 is a medium-severity vulnerability. It was published on August 8, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4GitHubgithub.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947Refsecurity.netapp.com/advisory/ntap-20210902-0010/Refcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4GitHubgithub.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947Refsecurity.netapp.com/advisory/ntap-20210902-0010/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-38203?

CVE-2021-38203 is a medium-severity vulnerability. It was published on August 8, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-38203?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-38203?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-38203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-38203 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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