Is CVE-2021-4149 in the CISA KEV catalog?

No. CVE-2021-4149 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4149?

CVE-2021-4149 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-4149?

CVE-2021-4149 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4149?

Upgrade linux on debian 12 to 5.14.16-1 or later. Fixes are available for 54 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4149

MEDIUM

5.5

CVSS v3

NVD

Description

A vulnerability was found in btrfs_alloc_tree_b in fs/btrfs/extent-tree.c in the Linux kernel due to an improper lock operation in btrfs. In this flaw, a user with a local privilege may cause a denial of service (DOS) due to a deadlock problem.

CWE-667

How to fix

Remediation Available

linuxDebian

Fixed in:5.14.16-1CVE-2021-4149

linuxUbuntu

Fixed in:4.4.0-239.273USN-6014-1

Fixed in:4.15.0-184.194USN-5466-1

linux-awsUbuntu

Fixed in:4.4.0-1117.123USN-6013-1

Fixed in:4.4.0-1155.170USN-6001-1

Fixed in:4.15.0-1133.143USN-5466-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1133.143~16.04.1USN-5466-1

linux-azureUbuntu

Fixed in:4.15.0-1142.156~14.04.1USN-5466-1

Fixed in:4.15.0-1142.156~16.04.1USN-5466-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1142.156USN-5466-1

linux-gcpUbuntu

Fixed in:4.15.0-1127.142~16.04.1USN-5466-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1127.142USN-5466-1

linux-hweUbuntu

Fixed in:4.15.0-184.194~16.04.1USN-5466-1

linux-image-4.15.0-1098-oracleUbuntu

Fixed in:4.15.0-1098.108~16.04.1USN-5466-1

Fixed in:4.15.0-1098.108USN-5466-1

linux-image-4.15.0-1114-raspi2Ubuntu

Fixed in:4.15.0-1114.122USN-5466-1

linux-image-4.15.0-1119-kvmUbuntu

Fixed in:4.15.0-1119.123USN-5466-1

linux-image-4.15.0-1127-gcpUbuntu

Fixed in:4.15.0-1127.142~16.04.1USN-5466-1

Fixed in:4.15.0-1127.142USN-5466-1

linux-image-4.15.0-1132-snapdragonUbuntu

Fixed in:4.15.0-1132.142USN-5466-1

linux-image-4.15.0-1133-awsUbuntu

Fixed in:4.15.0-1133.143USN-5466-1

linux-image-4.15.0-1133-aws-hweUbuntu

Fixed in:4.15.0-1133.143~16.04.1USN-5466-1

linux-image-4.15.0-1142-azureUbuntu

Fixed in:4.15.0-1142.156~14.04.1USN-5466-1

Fixed in:4.15.0-1142.156~16.04.1USN-5466-1

Fixed in:4.15.0-1142.156USN-5466-1

linux-image-4.15.0-184-genericUbuntu

Fixed in:4.15.0-184.194~16.04.1USN-5466-1

Fixed in:4.15.0-184.194USN-5466-1

linux-image-4.15.0-184-generic-lpaeUbuntu

Fixed in:4.15.0-184.194USN-5466-1

linux-image-4.15.0-184-lowlatencyUbuntu

Fixed in:4.15.0-184.194~16.04.1USN-5466-1

Fixed in:4.15.0-184.194USN-5466-1

linux-image-4.4.0-1117-awsUbuntu

Fixed in:4.4.0-1117.123USN-6013-1

linux-image-4.4.0-1118-kvmUbuntu

Fixed in:4.4.0-1118.128USN-6014-1

linux-image-4.4.0-1155-awsUbuntu

Fixed in:4.4.0-1155.170USN-6001-1

linux-image-4.4.0-239-genericUbuntu

Fixed in:4.4.0-239.273~14.04.1USN-6014-1

Fixed in:4.4.0-239.273USN-6014-1

linux-image-4.4.0-239-lowlatencyUbuntu

Fixed in:4.4.0-239.273~14.04.1USN-6014-1

Fixed in:4.4.0-239.273USN-6014-1

linux-image-awsUbuntu

Fixed in:4.4.0.1117.114USN-6013-1

Fixed in:4.4.0.1155.159USN-6001-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1133.122USN-5466-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1133.135USN-5466-1

linux-image-azureUbuntu

Fixed in:4.15.0.1142.113USN-5466-1

Fixed in:4.15.0.1142.131USN-5466-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1142.114USN-5466-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1127.126USN-5466-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1127.145USN-5466-1

linux-image-genericUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.184.172USN-5466-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.184.173USN-5466-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.184.172USN-5466-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.239.207USN-6014-1

Fixed in:4.4.0.239.245USN-6014-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1127.126USN-5466-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1118.115USN-6014-1

Fixed in:4.15.0.1119.114USN-5466-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.184.172USN-5466-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.184.173USN-5466-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.239.207USN-6014-1

Fixed in:4.4.0.239.245USN-6014-1

linux-image-oemUbuntu

Fixed in:4.15.0.184.173USN-5466-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1098.85USN-5466-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1098.107USN-5466-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1114.111USN-5466-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1132.133USN-5466-1

linux-image-virtualUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.184.172USN-5466-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.184.173USN-5466-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.239.207USN-6014-1

Fixed in:4.4.0.239.245USN-6014-1

linux-kvmUbuntu

Fixed in:4.4.0-1118.128USN-6014-1

Fixed in:4.15.0-1119.123USN-5466-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-239.273~14.04.1USN-6014-1

linux-oracleUbuntu

Fixed in:4.15.0-1098.108~16.04.1USN-5466-1

Fixed in:4.15.0-1098.108USN-5466-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1114.122USN-5466-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1132.142USN-5466-1

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Patch1

lkml.org

Exploit1

lkml.org

Third-Party Advisory2

Embed a live status badge for CVE-2021-4149

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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.