Is CVE-2021-20194 in the CISA KEV catalog?

No. CVE-2021-20194 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20194?

CVE-2021-20194 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-20194?

CVE-2021-20194 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20194?

Upgrade linux on debian 11 to 5.10.19-1 or later. Fixes are available for 66 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20194

HIGH

7.8

CVSS v3

NVD

Description

There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

CWE-20Improper Input Validation CWE-787Out-of-bounds Write

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.19-1CVE-2021-20194

linuxUbuntu

Fixed in:5.4.0-71.79USN-4909-1

linux-awsUbuntu

Fixed in:5.4.0-1043.45USN-4909-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4909-1

linux-azureUbuntu

Fixed in:5.4.0-1044.46USN-4909-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4909-1

linux-gcpUbuntu

Fixed in:5.4.0-1041.44USN-4909-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4909-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4909-1

linux-gkeopUbuntu

Fixed in:5.4.0-1013.14USN-4909-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1013.14~18.04.1USN-4909-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-45.51~20.04.1USN-4879-1

linux-image-5.10.0-1017-oemUbuntu

Fixed in:5.10.0-1017.18USN-4884-1

linux-image-5.4.0-1013-gkeopUbuntu

Fixed in:5.4.0-1013.14~18.04.1USN-4909-1

Fixed in:5.4.0-1013.14USN-4909-1

linux-image-5.4.0-1033-raspiUbuntu

Fixed in:5.4.0-1033.36~18.04.1USN-4909-1

Fixed in:5.4.0-1033.36USN-4909-1

linux-image-5.4.0-1037-kvmUbuntu

Fixed in:5.4.0-1037.38USN-4909-1

linux-image-5.4.0-1040-gkeUbuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4909-1

linux-image-5.4.0-1041-gcpUbuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4909-1

Fixed in:5.4.0-1041.44USN-4909-1

linux-image-5.4.0-1042-oracleUbuntu

Fixed in:5.4.0-1042.45~18.04.1USN-4909-1

Fixed in:5.4.0-1042.45USN-4909-1

linux-image-5.4.0-1043-awsUbuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4909-1

Fixed in:5.4.0-1043.45USN-4909-1

linux-image-5.4.0-1044-azureUbuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4909-1

Fixed in:5.4.0-1044.46USN-4909-1

linux-image-5.4.0-71-genericUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.4.0-71-generic-lpaeUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.4.0-71-lowlatencyUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.6.0-1053-oemUbuntu

Fixed in:5.6.0-1053.57USN-4912-1

linux-image-5.8.0-45-genericUbuntu

Fixed in:5.8.0-45.51~20.04.1USN-4879-1

linux-image-5.8.0-45-generic-64kUbuntu

Fixed in:5.8.0-45.51~20.04.1USN-4879-1

linux-image-5.8.0-45-generic-lpaeUbuntu

Fixed in:5.8.0-45.51~20.04.1USN-4879-1

linux-image-5.8.0-45-lowlatencyUbuntu

Fixed in:5.8.0-45.51~20.04.1USN-4879-1

linux-image-awsUbuntu

Fixed in:5.4.0.1043.26USN-4909-1

Fixed in:5.4.0.1043.44USN-4909-1

linux-image-azureUbuntu

Fixed in:5.4.0.1044.24USN-4909-1

Fixed in:5.4.0.1044.42USN-4909-1

linux-image-gcpUbuntu

Fixed in:5.4.0.1041.28USN-4909-1

Fixed in:5.4.0.1041.50USN-4909-1

linux-image-genericUbuntu

Fixed in:5.4.0.71.74USN-4909-1

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

Fixed in:5.8.0.45.51~20.04.31USN-4879-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.45.51~20.04.31USN-4879-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.71.74USN-4909-1

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

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

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

Fixed in:5.8.0.45.51~20.04.31USN-4879-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1040.42~18.04.7USN-4909-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1013.16USN-4909-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1013.14~18.04.14USN-4909-1

Fixed in:5.4.0.1013.16USN-4909-1

linux-image-kvmUbuntu

Fixed in:5.4.0.1037.35USN-4909-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.71.74USN-4909-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.45.51~20.04.31USN-4879-1

linux-image-oemUbuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-oem-20.04Ubuntu

Fixed in:5.6.0.1053.49USN-4912-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1017.18USN-4884-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1042.45~18.04.24USN-4909-1

Fixed in:5.4.0.1042.39USN-4909-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1033.68USN-4909-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1033.35USN-4909-1

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1033.68USN-4909-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-virtualUbuntu

Fixed in:5.4.0.71.74USN-4909-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.45.51~20.04.31USN-4879-1

linux-kvmUbuntu

Fixed in:5.4.0-1037.38USN-4909-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1017.18USN-4884-1

linux-oem-5.6Ubuntu

Fixed in:5.6.0-1053.57USN-4912-1

linux-oracleUbuntu

Fixed in:5.4.0-1042.45USN-4909-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1042.45~18.04.1USN-4909-1

linux-raspiUbuntu

Fixed in:5.4.0-1033.36USN-4909-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1033.36~18.04.1USN-4909-1

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

0.40%probability of exploitation in 30 days

32ndpercentile

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

References

Patch1

bugzilla.redhat.com

Third-Party Advisory1

security.netapp.com

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	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.