Is CVE-2021-3739 in the CISA KEV catalog?

No. CVE-2021-3739 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3739?

CVE-2021-3739 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-3739?

CVE-2021-3739 has an EPSS score of 0.58% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3739?

Upgrade linux on debian 11 to 5.10.46-5 or later. Fixes are available for 89 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3739

HIGH

7.1

CVSS v3

NVD

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.46-5CVE-2021-3739

Fixed in:5.14.6-1CVE-2021-3739

linuxUbuntu

Fixed in:5.4.0-90.101USN-5137-1

linux-awsUbuntu

Fixed in:5.4.0-1059.62USN-5137-1

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1020.21~20.04.2USN-5113-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1059.62~18.04.1USN-5137-1

linux-azureUbuntu

Fixed in:5.4.0-1063.66USN-5137-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1020.21~20.04.1USN-5113-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1063.66~18.04.1USN-5137-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1021.24USN-5137-2

linux-gcpUbuntu

Fixed in:5.4.0-1057.61USN-5137-1

linux-gcp-5.11Ubuntu

Fixed in:5.11.0-1021.23~20.04.1USN-5113-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1057.61~18.04.1USN-5137-1

linux-gkeUbuntu

Fixed in:5.4.0-1055.58USN-5137-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1055.58~18.04.1USN-5137-2

linux-gkeopUbuntu

Fixed in:5.4.0-1026.27USN-5137-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1026.27~18.04.1USN-5137-1

linux-hwe-5.11Ubuntu

Fixed in:5.11.0-38.42~20.04.1USN-5113-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-90.101~18.04.1USN-5137-1

linux-ibmUbuntu

Fixed in:5.4.0-1007.8USN-5137-1

linux-image-5.10.0-1050-oemUbuntu

Fixed in:5.10.0-1050.52USN-5115-1

linux-image-5.11.0-1020-awsUbuntu

Fixed in:5.11.0-1020.21~20.04.2USN-5113-1

linux-image-5.11.0-1020-azureUbuntu

Fixed in:5.11.0-1020.21~20.04.1USN-5113-1

linux-image-5.11.0-1020-oracleUbuntu

Fixed in:5.11.0-1020.21~20.04.1USN-5113-1

linux-image-5.11.0-1021-gcpUbuntu

Fixed in:5.11.0-1021.23~20.04.1USN-5113-1

linux-image-5.11.0-38-genericUbuntu

Fixed in:5.11.0-38.42~20.04.1USN-5113-1

linux-image-5.11.0-38-generic-64kUbuntu

Fixed in:5.11.0-38.42~20.04.1USN-5113-1

linux-image-5.11.0-38-generic-lpaeUbuntu

Fixed in:5.11.0-38.42~20.04.1USN-5113-1

linux-image-5.11.0-38-lowlatencyUbuntu

Fixed in:5.11.0-38.42~20.04.1USN-5113-1

linux-image-5.13.0-1017-oemUbuntu

Fixed in:5.13.0-1017.21USN-5117-1

linux-image-5.4.0-1007-ibmUbuntu

Fixed in:5.4.0-1007.8USN-5137-1

linux-image-5.4.0-1021-bluefieldUbuntu

Fixed in:5.4.0-1021.24USN-5137-2

linux-image-5.4.0-1026-gkeopUbuntu

Fixed in:5.4.0-1026.27~18.04.1USN-5137-1

Fixed in:5.4.0-1026.27USN-5137-1

linux-image-5.4.0-1046-raspiUbuntu

Fixed in:5.4.0-1046.50~18.04.1USN-5137-2

Fixed in:5.4.0-1046.50USN-5137-2

linux-image-5.4.0-1049-kvmUbuntu

Fixed in:5.4.0-1049.51USN-5137-1

linux-image-5.4.0-1055-gkeUbuntu

Fixed in:5.4.0-1055.58~18.04.1USN-5137-2

Fixed in:5.4.0-1055.58USN-5137-1

linux-image-5.4.0-1057-gcpUbuntu

Fixed in:5.4.0-1057.61~18.04.1USN-5137-1

Fixed in:5.4.0-1057.61USN-5137-1

linux-image-5.4.0-1057-oracleUbuntu

Fixed in:5.4.0-1057.61~18.04.1USN-5137-2

Fixed in:5.4.0-1057.61USN-5137-2

linux-image-5.4.0-1059-awsUbuntu

Fixed in:5.4.0-1059.62~18.04.1USN-5137-1

Fixed in:5.4.0-1059.62USN-5137-1

linux-image-5.4.0-1063-azureUbuntu

Fixed in:5.4.0-1063.66~18.04.1USN-5137-1

Fixed in:5.4.0-1063.66USN-5137-1

linux-image-5.4.0-90-genericUbuntu

Fixed in:5.4.0-90.101~18.04.1USN-5137-1

Fixed in:5.4.0-90.101USN-5137-1

linux-image-5.4.0-90-generic-lpaeUbuntu

Fixed in:5.4.0-90.101~18.04.1USN-5137-1

Fixed in:5.4.0-90.101USN-5137-1

linux-image-5.4.0-90-lowlatencyUbuntu

Fixed in:5.4.0-90.101~18.04.1USN-5137-1

Fixed in:5.4.0-90.101USN-5137-1

linux-image-awsUbuntu

Fixed in:5.4.0.1059.42USN-5137-1

Fixed in:5.11.0.1020.21~20.04.19USN-5113-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1059.62USN-5137-1

linux-image-azureUbuntu

Fixed in:5.4.0.1063.43USN-5137-1

linux-image-azure-edgeUbuntu

Fixed in:5.11.0.1020.21~20.04.19USN-5113-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1063.61USN-5137-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1021.22USN-5137-2

linux-image-gcpUbuntu

Fixed in:5.4.0.1057.43USN-5137-1

Fixed in:5.11.0.1021.23~20.04.20USN-5113-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1057.67USN-5137-1

linux-image-genericUbuntu

Fixed in:5.4.0.90.94USN-5137-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.11.0.38.42~20.04.17USN-5113-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.11.0.38.42~20.04.17USN-5113-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.90.94USN-5137-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.11.0.38.42~20.04.17USN-5113-1

linux-image-gkeUbuntu

Fixed in:5.4.0.1055.65USN-5137-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1055.58~18.04.20USN-5137-2

Fixed in:5.4.0.1055.65USN-5137-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1026.29USN-5137-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1026.27~18.04.27USN-5137-1

Fixed in:5.4.0.1026.29USN-5137-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1007.8USN-5137-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1007.8USN-5137-1

linux-image-kvmUbuntu

Fixed in:5.4.0.1049.48USN-5137-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.90.94USN-5137-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.11.0.38.42~20.04.17USN-5113-1

linux-image-oemUbuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

Fixed in:5.4.0.90.94USN-5137-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1050.52USN-5115-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1050.52USN-5115-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1017.21USN-5117-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

Fixed in:5.4.0.90.94USN-5137-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1057.61~18.04.37USN-5137-2

Fixed in:5.11.0.1020.21~20.04.13USN-5113-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1057.57USN-5137-2

linux-image-raspiUbuntu

Fixed in:5.4.0.1046.81USN-5137-2

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1046.49USN-5137-2

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1046.81USN-5137-2

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

linux-image-virtualUbuntu

Fixed in:5.4.0.90.94USN-5137-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.90.101~18.04.80USN-5137-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.11.0.38.42~20.04.17USN-5113-1

linux-kvmUbuntu

Fixed in:5.4.0-1049.51USN-5137-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1050.52USN-5115-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1017.21USN-5117-1

linux-oracleUbuntu

Fixed in:5.4.0-1057.61USN-5137-2

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1020.21~20.04.1USN-5113-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1057.61~18.04.1USN-5137-2

linux-raspiUbuntu

Fixed in:5.4.0-1046.50USN-5137-2

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1046.50~18.04.1USN-5137-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.58%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Patch4

Third-Party Advisory2

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.