Vulnerability record · CVE-2021-38203 · published 8 August 2021

CVE-2021-38203: Linux kernel vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.37% · top 72.2% CWE-667 · CWE-667

5.5CVSS 3.1 base score, v2 2.1

0.37%EPSS exploitation probability, 30 days

NoNot in CISA KEV

5Affected product versions listed by NVD

6References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Linux Kernel Linux NElement Software Netapp NHci Bootstrap Os Netapp NHci Management Node Netapp NSolidfire Netapp

References

Link	Tags
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4	Mailing ListPatchVendor Advisory
https://github.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947	ExploitPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0010/	Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4	Mailing ListPatchVendor Advisory
https://github.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947	ExploitPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0010/	Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-38203), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.