Improper locking in Linux kernel - CVE-2021-38203

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Main Vulnerability Database Vulnerabilities #VU92756

Improper locking in Linux kernel - CVE-2021-38203

Published: August 8, 2021 / Updated: May 3, 2022


Vulnerability identifier: #VU92756
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-38203
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

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.


Affected software

Linux kernel
Ubuntu
linux-image-5.13.0-1014-oem (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)

How to mitigate CVE-2021-38203

Install update from vendor's repository.

linux-image-5.13.0-1014-oem (Ubuntu package) - update to 5.13.0-1014.18
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1014.18

External References

Related Security Bulletins