CVE-2021-3739

Name: CVE-2021-3739
Creator: NVD / NIST
Published: 2022-03-10T17:43:01.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2021-3739 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.58%

43.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	<= 5.14.20
Fedoraproject	Fedora	34
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H300e Firmware	All versions
Netapp	H500e Firmware	All versions
Netapp	H700e Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H410c Firmware	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1997958Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Exploit, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20220407-0006/Third Party Advisory
https://ubuntu.com/security/CVE-2021-3739Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/08/25/3Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1997958Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Exploit, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20220407-0006/Third Party Advisory
https://ubuntu.com/security/CVE-2021-3739Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/08/25/3Mailing List, Patch, Third Party Advisory

Timeline

Published: Mar 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3739?

How severe is CVE-2021-3739?

CVE-2021-3739 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST