Is CVE-2021-4197 in the CISA KEV catalog?

No. CVE-2021-4197 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4197?

CVE-2021-4197 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-4197?

CVE-2021-4197 has an EPSS score of 0.54% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4197?

Upgrade linux on debian 11 to 5.10.113-1 or later. Fixes are available for 123 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4197

HIGH

7.8

CVSS v3

NVD

Description

An unprivileged write to the file handler flaw in the Linux kernel's control groups and namespaces subsystem was found in the way users have access to some less privileged process that are controlled by cgroups and have higher privileged parent process. It is actually both for cgroup2 and cgroup1 versions of control groups. A local user could use this flaw to crash the system or escalate their privileges on the system.

CWE-287Improper Authentication

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.113-1CVE-2021-4197

Fixed in:5.15.15-1CVE-2021-4197

linuxUbuntu

Fixed in:4.4.0-229.263USN-5500-1

Fixed in:4.15.0-189.200USN-5515-1

Fixed in:5.4.0-117.132USN-5467-1

linux-awsUbuntu

Fixed in:4.4.0-1109.115USN-5513-1

Fixed in:4.4.0-1145.160USN-5500-1

Fixed in:4.15.0-1137.148USN-5515-1

Fixed in:5.4.0-1078.84USN-5467-1

linux-aws-5.13Ubuntu

Fixed in:5.13.0-1019.21~20.04.1USN-5337-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1078.84~18.04.1USN-5467-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1137.148~16.04.1USN-5515-1

linux-azureUbuntu

Fixed in:4.15.0-1146.161~14.04.1USN-5515-1

Fixed in:4.15.0-1146.161~16.04.1USN-5541-1

Fixed in:5.4.0-1083.87USN-5467-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1146.161USN-5515-1

linux-azure-5.13Ubuntu

Fixed in:5.13.0-1021.24~20.04.1USN-5368-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1083.87~18.04.1USN-5467-1

linux-azure-fdeUbuntu

Fixed in:5.4.0-1083.87+cvm1.1USN-5467-1

linux-dell300xUbuntu

Fixed in:4.15.0-1049.54USN-5515-1

linux-gcpUbuntu

Fixed in:4.15.0-1131.147~16.04.1USN-5515-1

Fixed in:5.4.0-1078.84USN-5467-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1131.147USN-5515-1

linux-gcp-5.13Ubuntu

Fixed in:5.13.0-1021.25~20.04.1USN-5337-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1078.84~18.04.1USN-5467-1

linux-gkeUbuntu

Fixed in:5.4.0-1074.79USN-5467-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1074.79~18.04.1USN-5467-1

linux-gkeopUbuntu

Fixed in:5.4.0-1046.48USN-5467-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5467-1

linux-hweUbuntu

Fixed in:4.15.0-189.200~16.04.1USN-5515-1

linux-hwe-5.13Ubuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-117.132~18.04.1USN-5467-1

linux-ibmUbuntu

Fixed in:5.4.0-1026.29USN-5467-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1026.29~18.04.1USN-5467-1

linux-image-4.15.0-1049-dell300xUbuntu

Fixed in:4.15.0-1049.54USN-5515-1

linux-image-4.15.0-1102-oracleUbuntu

Fixed in:4.15.0-1102.113~16.04.1USN-5515-1

Fixed in:4.15.0-1102.113USN-5515-1

linux-image-4.15.0-1115-raspi2Ubuntu

Fixed in:4.15.0-1115.123USN-5515-1

linux-image-4.15.0-1123-kvmUbuntu

Fixed in:4.15.0-1123.128USN-5515-1

linux-image-4.15.0-1131-gcpUbuntu

Fixed in:4.15.0-1131.147~16.04.1USN-5515-1

Fixed in:4.15.0-1131.147USN-5515-1

linux-image-4.15.0-1133-snapdragonUbuntu

Fixed in:4.15.0-1133.143USN-5515-1

linux-image-4.15.0-1137-awsUbuntu

Fixed in:4.15.0-1137.148USN-5515-1

linux-image-4.15.0-1137-aws-hweUbuntu

Fixed in:4.15.0-1137.148~16.04.1USN-5515-1

linux-image-4.15.0-1146-azureUbuntu

Fixed in:4.15.0-1146.161~14.04.1USN-5515-1

Fixed in:4.15.0-1146.161~16.04.1USN-5541-1

Fixed in:4.15.0-1146.161USN-5515-1

linux-image-4.15.0-189-genericUbuntu

Fixed in:4.15.0-189.200~16.04.1USN-5515-1

Fixed in:4.15.0-189.200USN-5515-1

linux-image-4.15.0-189-generic-lpaeUbuntu

Fixed in:4.15.0-189.200USN-5515-1

linux-image-4.15.0-189-lowlatencyUbuntu

Fixed in:4.15.0-189.200~16.04.1USN-5515-1

Fixed in:4.15.0-189.200USN-5515-1

linux-image-4.4.0-1109-awsUbuntu

Fixed in:4.4.0-1109.115USN-5513-1

linux-image-4.4.0-1110-kvmUbuntu

Fixed in:4.4.0-1110.120USN-5505-1

linux-image-4.4.0-1145-awsUbuntu

Fixed in:4.4.0-1145.160USN-5500-1

linux-image-4.4.0-229-genericUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

Fixed in:4.4.0-229.263USN-5500-1

linux-image-4.4.0-229-lowlatencyUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

Fixed in:4.4.0-229.263USN-5500-1

linux-image-5.13.0-1019-awsUbuntu

Fixed in:5.13.0-1019.21~20.04.1USN-5337-1

linux-image-5.13.0-1021-azureUbuntu

Fixed in:5.13.0-1021.24~20.04.1USN-5368-1

linux-image-5.13.0-1021-gcpUbuntu

Fixed in:5.13.0-1021.25~20.04.1USN-5337-1

linux-image-5.13.0-1025-oracleUbuntu

Fixed in:5.13.0-1025.30~20.04.1USN-5368-1

linux-image-5.13.0-37-genericUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-generic-64kUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-generic-lpaeUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-lowlatencyUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.14.0-1022-oemUbuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-image-5.4.0-1026-ibmUbuntu

Fixed in:5.4.0-1026.29~18.04.1USN-5467-1

Fixed in:5.4.0-1026.29USN-5467-1

linux-image-5.4.0-1046-gkeopUbuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5467-1

Fixed in:5.4.0-1046.48USN-5467-1

linux-image-5.4.0-1065-raspiUbuntu

Fixed in:5.4.0-1065.75~18.04.1USN-5467-1

Fixed in:5.4.0-1065.75USN-5467-1

linux-image-5.4.0-1068-kvmUbuntu

Fixed in:5.4.0-1068.72USN-5467-1

linux-image-5.4.0-1074-gkeUbuntu

Fixed in:5.4.0-1074.79~18.04.1USN-5467-1

Fixed in:5.4.0-1074.79USN-5467-1

linux-image-5.4.0-1076-oracleUbuntu

Fixed in:5.4.0-1076.83~18.04.1USN-5467-1

Fixed in:5.4.0-1076.83USN-5467-1

linux-image-5.4.0-1078-awsUbuntu

Fixed in:5.4.0-1078.84~18.04.1USN-5467-1

Fixed in:5.4.0-1078.84USN-5467-1

linux-image-5.4.0-1078-gcpUbuntu

Fixed in:5.4.0-1078.84~18.04.1USN-5467-1

Fixed in:5.4.0-1078.84USN-5467-1

linux-image-5.4.0-1083-azureUbuntu

Fixed in:5.4.0-1083.87~18.04.1USN-5467-1

Fixed in:5.4.0-1083.87USN-5467-1

linux-image-5.4.0-1083-azure-fdeUbuntu

Fixed in:5.4.0-1083.87+cvm1.1USN-5467-1

linux-image-5.4.0-117-genericUbuntu

Fixed in:5.4.0-117.132~18.04.1USN-5467-1

Fixed in:5.4.0-117.132USN-5467-1

linux-image-5.4.0-117-generic-lpaeUbuntu

Fixed in:5.4.0-117.132~18.04.1USN-5467-1

Fixed in:5.4.0-117.132USN-5467-1

linux-image-5.4.0-117-lowlatencyUbuntu

Fixed in:5.4.0-117.132~18.04.1USN-5467-1

Fixed in:5.4.0-117.132USN-5467-1

linux-image-awsUbuntu

Fixed in:4.4.0.1109.106USN-5513-1

Fixed in:4.4.0.1145.149USN-5500-1

Fixed in:5.4.0.1078.59USN-5467-1

Fixed in:5.13.0.1019.21~20.04.12USN-5337-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1137.124USN-5515-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1137.137USN-5515-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1078.79USN-5467-1

linux-image-azureUbuntu

Fixed in:4.15.0.1146.115USN-5515-1

Fixed in:4.15.0.1146.133USN-5541-1

Fixed in:5.4.0.1083.61USN-5467-1

Fixed in:5.13.0.1021.24~20.04.10USN-5368-1

linux-image-azure-fdeUbuntu

Fixed in:5.4.0.1083.87+cvm1.24USN-5467-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1146.116USN-5515-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1083.81USN-5467-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1049.49USN-5515-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1131.127USN-5515-1

Fixed in:5.4.0.1078.60USN-5467-1

Fixed in:5.13.0.1021.25~20.04.1USN-5337-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1131.147USN-5515-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1078.85USN-5467-1

linux-image-genericUbuntu

Fixed in:4.4.0.229.235USN-5500-1

Fixed in:4.15.0.189.174USN-5515-1

Fixed in:5.4.0.117.120USN-5467-1

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

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.189.176USN-5515-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.189.174USN-5515-1

Fixed in:5.4.0.117.120USN-5467-1

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

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

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

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1131.127USN-5515-1

Fixed in:5.4.0.1074.83USN-5467-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1074.79~18.04.37USN-5467-1

Fixed in:5.4.0.1074.83USN-5467-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1046.48USN-5467-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1046.48~18.04.44USN-5467-1

Fixed in:5.4.0.1046.48USN-5467-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1026.41USN-5467-1

Fixed in:5.4.0.1026.24USN-5467-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1026.24USN-5467-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1110.107USN-5505-1

Fixed in:4.15.0.1123.116USN-5515-1

Fixed in:5.4.0.1068.66USN-5467-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.229.235USN-5500-1

Fixed in:4.15.0.189.174USN-5515-1

Fixed in:5.4.0.117.120USN-5467-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.189.176USN-5515-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-image-oemUbuntu

Fixed in:4.15.0.189.176USN-5515-1

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

Fixed in:5.4.0.117.120USN-5467-1

linux-image-oem-20.04dUbuntu

Fixed in:5.14.0.1022.19USN-5278-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

Fixed in:5.4.0.117.120USN-5467-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1102.86USN-5515-1

Fixed in:5.4.0.1076.83~18.04.54USN-5467-1

Fixed in:5.13.0.1025.30~20.04.1USN-5368-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1102.109USN-5515-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1076.75USN-5467-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1065.98USN-5467-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1065.65USN-5467-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1115.112USN-5515-1

Fixed in:5.4.0.1065.98USN-5467-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1133.134USN-5515-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

linux-image-virtualUbuntu

Fixed in:4.4.0.229.235USN-5500-1

Fixed in:4.15.0.189.174USN-5515-1

Fixed in:5.4.0.117.120USN-5467-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.189.176USN-5515-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.117.132~18.04.99USN-5467-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-kvmUbuntu

Fixed in:4.4.0-1110.120USN-5505-1

Fixed in:4.15.0-1123.128USN-5515-1

Fixed in:5.4.0-1068.72USN-5467-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

linux-oem-5.14Ubuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-oracleUbuntu

Fixed in:4.15.0-1102.113~16.04.1USN-5515-1

Fixed in:4.15.0-1102.113USN-5515-1

Fixed in:5.4.0-1076.83USN-5467-1

linux-oracle-5.13Ubuntu

Fixed in:5.13.0-1025.30~20.04.1USN-5368-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1076.83~18.04.1USN-5467-1

linux-raspiUbuntu

Fixed in:5.4.0-1065.75USN-5467-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1065.75~18.04.1USN-5467-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1115.123USN-5515-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1133.143USN-5515-1

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.54%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Third-Party Advisory5

Other references1

lore.kernel.org

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	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.