What’s Vulnerable › Vulnerabilities

CVE-2021-38203

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-08 · updated 2026-06-17
• Weakness: CWE-667

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.

Affected products

• Linux kernel: before 5.13.4 — fixed in 5.13.4
• NetApp Element Software: all versions
• NetApp Hci Bootstrap Os: all versions
• NetApp Hci Management Node: all versions
• NetApp Solidfire: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.13.4. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
• https://github.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947
• https://security.netapp.com/advisory/ntap-20210902-0010/
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
• https://github.com/torvalds/linux/commit/1cb3db1cf383a3c7dbda1aa0ce748b0958759947
• https://security.netapp.com/advisory/ntap-20210902-0010/

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