Is CVE-2021-43389 in the CISA KEV catalog?

No. CVE-2021-43389 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43389?

CVE-2021-43389 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-43389?

CVE-2021-43389 has an EPSS score of 0.67% (47th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43389?

Upgrade linux on debian 11 to 5.10.84-1 or later. Fixes are available for 127 affected products.

CVE & CISA-KEV Catalog

CVE-2021-43389

MEDIUM

5.5

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel before 5.14.15. There is an array-index-out-of-bounds flaw in the detach_capi_ctr function in drivers/isdn/capi/kcapi.c.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.84-1CVE-2021-43389

Fixed in:5.14.16-1CVE-2021-43389

linuxUbuntu

Fixed in:4.4.0-222.255USN-5343-1

Fixed in:4.15.0-166.174USN-5209-1

Fixed in:5.4.0-92.103USN-5210-1

linux-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

Fixed in:4.4.0-1138.152USN-5343-1

Fixed in:4.15.0-1118.125USN-5209-1

Fixed in:5.4.0-1061.64USN-5210-1

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1061.64~18.04.1USN-5210-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1118.125~16.04.1USN-5209-1

linux-azureUbuntu

Fixed in:4.15.0-1129.142~14.04.1USN-5209-1

Fixed in:4.15.0-1129.142~16.04.1USN-5209-1

Fixed in:5.4.0-1065.68USN-5210-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1129.142USN-5209-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1065.68~18.04.1USN-5210-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1023.26USN-5210-1

linux-dell300xUbuntu

Fixed in:4.15.0-1033.38USN-5209-1

linux-gcpUbuntu

Fixed in:4.15.0-1114.128~16.04.1USN-5209-1

Fixed in:5.4.0-1059.63USN-5210-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1114.128USN-5209-1

linux-gcp-5.11Ubuntu

Fixed in:5.11.0-1024.26~20.04.1USN-5208-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1059.63~18.04.1USN-5210-1

linux-gkeUbuntu

Fixed in:5.4.0-1057.60USN-5210-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1057.60~18.04.1USN-5210-1

linux-gkeopUbuntu

Fixed in:5.4.0-1029.30USN-5210-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1029.30~18.04.2USN-5210-1

linux-hweUbuntu

Fixed in:4.15.0-166.174~16.04.1USN-5209-1

linux-hwe-5.11Ubuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-92.103~18.04.2USN-5210-1

linux-ibmUbuntu

Fixed in:5.4.0-1010.11USN-5210-1

linux-image-4.15.0-1033-dell300xUbuntu

Fixed in:4.15.0-1033.38USN-5209-1

linux-image-4.15.0-1085-oracleUbuntu

Fixed in:4.15.0-1085.93~16.04.1USN-5209-1

Fixed in:4.15.0-1085.93USN-5209-1

linux-image-4.15.0-1101-raspi2Ubuntu

Fixed in:4.15.0-1101.108USN-5209-1

linux-image-4.15.0-1105-kvmUbuntu

Fixed in:4.15.0-1105.107USN-5209-1

linux-image-4.15.0-1114-gcpUbuntu

Fixed in:4.15.0-1114.128~16.04.1USN-5209-1

Fixed in:4.15.0-1114.128USN-5209-1

linux-image-4.15.0-1118-awsUbuntu

Fixed in:4.15.0-1118.125~16.04.1USN-5209-1

Fixed in:4.15.0-1118.125USN-5209-1

linux-image-4.15.0-1118-snapdragonUbuntu

Fixed in:4.15.0-1118.127USN-5209-1

linux-image-4.15.0-1129-azureUbuntu

Fixed in:4.15.0-1129.142~14.04.1USN-5209-1

Fixed in:4.15.0-1129.142~16.04.1USN-5209-1

Fixed in:4.15.0-1129.142USN-5209-1

linux-image-4.15.0-166-genericUbuntu

Fixed in:4.15.0-166.174~16.04.1USN-5209-1

Fixed in:4.15.0-166.174USN-5209-1

linux-image-4.15.0-166-generic-lpaeUbuntu

Fixed in:4.15.0-166.174USN-5209-1

linux-image-4.15.0-166-lowlatencyUbuntu

Fixed in:4.15.0-166.174~16.04.1USN-5209-1

Fixed in:4.15.0-166.174USN-5209-1

linux-image-4.4.0-1102-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

linux-image-4.4.0-1103-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

linux-image-4.4.0-1138-awsUbuntu

Fixed in:4.4.0-1138.152USN-5343-1

linux-image-4.4.0-222-genericUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-4.4.0-222-lowlatencyUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-5.10.0-1051-oemUbuntu

Fixed in:5.10.0-1051.53USN-5139-1

linux-image-5.11.0-1023-awsUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1023-azureUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1023-oracleUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1024-gcpUbuntu

Fixed in:5.11.0-1024.26~20.04.1USN-5208-1

linux-image-5.11.0-44-genericUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-generic-64kUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-generic-lpaeUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-lowlatencyUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.13.0-1026-oemUbuntu

Fixed in:5.13.0-1026.32USN-5218-1

linux-image-5.14.0-1008-oemUbuntu

Fixed in:5.14.0-1008.8USN-5165-1

linux-image-5.4.0-1010-ibmUbuntu

Fixed in:5.4.0-1010.11USN-5210-1

linux-image-5.4.0-1023-bluefieldUbuntu

Fixed in:5.4.0-1023.26USN-5210-1

linux-image-5.4.0-1029-gkeopUbuntu

Fixed in:5.4.0-1029.30~18.04.2USN-5210-1

Fixed in:5.4.0-1029.30USN-5210-1

linux-image-5.4.0-1048-raspiUbuntu

Fixed in:5.4.0-1048.53~18.04.1USN-5210-1

Fixed in:5.4.0-1048.53USN-5210-1

linux-image-5.4.0-1051-kvmUbuntu

Fixed in:5.4.0-1051.53USN-5210-1

linux-image-5.4.0-1057-gkeUbuntu

Fixed in:5.4.0-1057.60~18.04.1USN-5210-1

Fixed in:5.4.0-1057.60USN-5210-1

linux-image-5.4.0-1059-gcpUbuntu

Fixed in:5.4.0-1059.63~18.04.1USN-5210-1

Fixed in:5.4.0-1059.63USN-5210-1

linux-image-5.4.0-1059-oracleUbuntu

Fixed in:5.4.0-1059.63~18.04.1USN-5210-1

Fixed in:5.4.0-1059.63USN-5210-1

linux-image-5.4.0-1065-azureUbuntu

Fixed in:5.4.0-1065.68~18.04.1USN-5210-1

Fixed in:5.4.0-1065.68USN-5210-1

linux-image-5.4.0-92-genericUbuntu

Fixed in:5.4.0-92.103~18.04.2USN-5210-1

Fixed in:5.4.0-92.103USN-5210-1

linux-image-5.4.0-92-generic-lpaeUbuntu

Fixed in:5.4.0-92.103~18.04.2USN-5210-1

Fixed in:5.4.0-92.103USN-5210-1

linux-image-5.4.0-92-lowlatencyUbuntu

Fixed in:5.4.0-92.103~18.04.2USN-5210-1

Fixed in:5.4.0-92.103USN-5210-1

linux-image-awsUbuntu

Fixed in:4.4.0.1102.100USN-5343-1

Fixed in:4.4.0.1138.143USN-5343-1

Fixed in:5.4.0.1061.44USN-5210-1

Fixed in:5.11.0.1023.24~20.04.23USN-5208-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1118.108USN-5209-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1118.121USN-5209-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1061.64USN-5210-1

linux-image-azureUbuntu

Fixed in:4.15.0.1129.102USN-5209-1

Fixed in:4.15.0.1129.120USN-5209-1

Fixed in:5.4.0.1065.45USN-5210-1

Fixed in:5.11.0.1023.24~20.04.23USN-5208-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1129.102USN-5209-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1065.63USN-5210-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1023.24USN-5210-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1033.35USN-5209-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1114.115USN-5209-1

Fixed in:5.4.0.1059.45USN-5210-1

Fixed in:5.11.0.1024.26~20.04.24USN-5208-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1114.133USN-5209-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1059.69USN-5210-1

linux-image-genericUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.166.155USN-5209-1

Fixed in:5.4.0.92.96USN-5210-1

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

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.166.158USN-5209-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.166.155USN-5209-1

Fixed in:5.4.0.92.96USN-5210-1

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

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

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

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1114.115USN-5209-1

Fixed in:5.4.0.1057.67USN-5210-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1057.60~18.04.22USN-5210-1

Fixed in:5.4.0.1057.67USN-5210-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1029.32USN-5210-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1029.30~18.04.30USN-5210-1

Fixed in:5.4.0.1029.32USN-5210-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1010.11USN-5210-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1010.11USN-5210-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1103.101USN-5343-1

Fixed in:4.15.0.1105.101USN-5209-1

Fixed in:5.4.0.1051.50USN-5210-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.166.155USN-5209-1

Fixed in:5.4.0.92.96USN-5210-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.166.158USN-5209-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-oemUbuntu

Fixed in:4.15.0.166.158USN-5209-1

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

Fixed in:5.4.0.92.96USN-5210-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1051.53USN-5139-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1051.53USN-5139-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1026.29USN-5218-1

linux-image-oem-20.04dUbuntu

Fixed in:5.14.0.1008.8USN-5165-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

Fixed in:5.4.0.92.96USN-5210-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1085.73USN-5209-1

Fixed in:5.4.0.1059.63~18.04.39USN-5210-1

Fixed in:5.11.0.1023.24~20.04.16USN-5208-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1085.95USN-5209-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1059.59USN-5210-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1048.83USN-5210-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1048.51USN-5210-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1101.99USN-5209-1

Fixed in:5.4.0.1048.83USN-5210-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1118.121USN-5209-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

linux-image-virtualUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.166.155USN-5209-1

Fixed in:5.4.0.92.96USN-5210-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.166.158USN-5209-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.92.103~18.04.82USN-5210-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

Fixed in:4.15.0-1105.107USN-5209-1

Fixed in:5.4.0-1051.53USN-5210-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1051.53USN-5139-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1026.32USN-5218-1

linux-oem-5.14Ubuntu

Fixed in:5.14.0-1008.8USN-5165-1

linux-oracleUbuntu

Fixed in:4.15.0-1085.93~16.04.1USN-5209-1

Fixed in:4.15.0-1085.93USN-5209-1

Fixed in:5.4.0-1059.63USN-5210-1

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1059.63~18.04.1USN-5210-1

linux-raspiUbuntu

Fixed in:5.4.0-1048.53USN-5210-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1048.53~18.04.1USN-5210-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1101.108USN-5209-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1118.127USN-5209-1

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

0.67%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Patch3

Exploit1

seclists.org

Third-Party Advisory5

Other references1

lore.kernel.org

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.