CVE-2021-38203 Denial of service in n/a

What is CVE-2021-38203?

CVE-2021-38203 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-667

Which versions are affected by CVE-2021-38203?

It affects 5 products.

Products include Linux kernel, Netapp Element Software, Netapp Hci Bootstrap Os, Netapp Hci Management Node, Netapp Solidfire.

How do I fix CVE-2021-38203?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-38203 being exploited?

There is no known exploitation of CVE-2021-38203 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6587, DEBIAN-CVE-2021-38203, GHSA-5fjr-c5p8-hxvj, UBUNTU-CVE-2021-38203.