Is CVE-2021-3669 in the CISA KEV catalog?

No. CVE-2021-3669 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3669?

CVE-2021-3669 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-3669?

CVE-2021-3669 has an EPSS score of 0.28% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3669?

Upgrade linux on debian 11 to 5.10.226-1 or later. Fixes are available for 101 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3669

MEDIUM

5.5

CVSS v3

NVD

Description

A flaw was found in the Linux kernel. Measuring usage of the shared memory does not scale with large shared memory segment counts which could lead to resource exhaustion and DoS.

CWE-400Resource Exhaustion CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.226-1CVE-2021-3669

Fixed in:5.15.3-1CVE-2021-3669

linuxUbuntu

Fixed in:4.4.0-239.273USN-6014-1

Fixed in:4.15.0-208.220USN-5984-1

Fixed in:5.4.0-146.163USN-5980-1

linux-awsUbuntu

Fixed in:4.4.0-1117.123USN-6013-1

Fixed in:4.4.0-1155.170USN-6001-1

Fixed in:4.15.0-1153.166USN-5984-1

Fixed in:5.4.0-1099.107USN-5980-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1099.107~18.04.1USN-5985-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1153.166~16.04.1USN-5981-1

linux-azureUbuntu

Fixed in:4.15.0-1162.177~14.04.1USN-5924-1

Fixed in:4.15.0-1162.177~16.04.1USN-5975-1

Fixed in:5.4.0-1105.111USN-5980-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1162.177USN-5927-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1105.111~18.04.1USN-5985-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1060.66USN-6020-1

linux-dell300xUbuntu

Fixed in:4.15.0-1062.67USN-5984-1

linux-gcpUbuntu

Fixed in:4.15.0-1147.163~16.04.1USN-6009-1

Fixed in:5.4.0-1102.111USN-5980-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1147.163USN-5991-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1102.111~18.04.2USN-5985-1

linux-gkeUbuntu

Fixed in:5.4.0-1096.103USN-5980-1

linux-gkeopUbuntu

Fixed in:5.4.0-1066.70USN-5980-1

linux-hweUbuntu

Fixed in:4.15.0-208.219~16.04.1USN-5981-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-146.163~18.04.1USN-5985-1

linux-ibmUbuntu

Fixed in:5.4.0-1046.51USN-5980-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1046.51~18.04.1USN-5985-1

linux-image-4.15.0-1062-dell300xUbuntu

Fixed in:4.15.0-1062.67USN-5984-1

linux-image-4.15.0-1116-oracleUbuntu

Fixed in:4.15.0-1116.127~16.04.1USN-5981-1

Fixed in:4.15.0-1116.127USN-5984-1

linux-image-4.15.0-1129-raspi2Ubuntu

Fixed in:4.15.0-1129.137USN-5984-1

linux-image-4.15.0-1137-kvmUbuntu

Fixed in:4.15.0-1137.142USN-5984-1

linux-image-4.15.0-1147-gcpUbuntu

Fixed in:4.15.0-1147.163~16.04.1USN-6009-1

Fixed in:4.15.0-1147.163USN-5991-1

linux-image-4.15.0-1148-snapdragonUbuntu

Fixed in:4.15.0-1148.158USN-6030-1

linux-image-4.15.0-1153-awsUbuntu

Fixed in:4.15.0-1153.166~16.04.1USN-5981-1

Fixed in:4.15.0-1153.166USN-5984-1

linux-image-4.15.0-1162-azureUbuntu

Fixed in:4.15.0-1162.177~14.04.1+1USN-5924-1

Fixed in:4.15.0-1162.177~16.04.1USN-5975-1

Fixed in:4.15.0-1162.177USN-5927-1

linux-image-4.15.0-208-genericUbuntu

Fixed in:4.15.0-208.219~16.04.1USN-5981-1

Fixed in:4.15.0-208.220USN-5984-1

linux-image-4.15.0-208-generic-lpaeUbuntu

Fixed in:4.15.0-208.220USN-5984-1

linux-image-4.15.0-208-lowlatencyUbuntu

Fixed in:4.15.0-208.219~16.04.1USN-5981-1

Fixed in:4.15.0-208.220USN-5984-1

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-5.4.0-1023-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1023.27USN-6151-1

linux-image-5.4.0-1046-ibmUbuntu

Fixed in:5.4.0-1046.51~18.04.1USN-5985-1

Fixed in:5.4.0-1046.51USN-5980-1

linux-image-5.4.0-1060-bluefieldUbuntu

Fixed in:5.4.0-1060.66USN-6020-1

linux-image-5.4.0-1066-gkeopUbuntu

Fixed in:5.4.0-1066.70USN-5980-1

linux-image-5.4.0-1082-raspiUbuntu

Fixed in:5.4.0-1082.93~18.04.1USN-5985-1

Fixed in:5.4.0-1082.93USN-5980-1

linux-image-5.4.0-1088-kvmUbuntu

Fixed in:5.4.0-1088.94USN-5980-1

linux-image-5.4.0-1096-gkeUbuntu

Fixed in:5.4.0-1096.103USN-5980-1

linux-image-5.4.0-1098-oracleUbuntu

Fixed in:5.4.0-1098.107~18.04.1USN-5985-1

Fixed in:5.4.0-1098.107USN-5980-1

linux-image-5.4.0-1099-awsUbuntu

Fixed in:5.4.0-1099.107~18.04.1USN-5985-1

Fixed in:5.4.0-1099.107USN-5980-1

linux-image-5.4.0-1102-gcpUbuntu

Fixed in:5.4.0-1102.111~18.04.2USN-5985-1

Fixed in:5.4.0-1102.111USN-5980-1

linux-image-5.4.0-1105-azureUbuntu

Fixed in:5.4.0-1105.111~18.04.1USN-5985-1

Fixed in:5.4.0-1105.111USN-5980-1

linux-image-5.4.0-146-genericUbuntu

Fixed in:5.4.0-146.163~18.04.1USN-5985-1

Fixed in:5.4.0-146.163USN-5980-1

linux-image-5.4.0-146-generic-lpaeUbuntu

Fixed in:5.4.0-146.163~18.04.1USN-5985-1

Fixed in:5.4.0-146.163USN-5980-1

linux-image-5.4.0-146-lowlatencyUbuntu

Fixed in:5.4.0-146.163~18.04.1USN-5985-1

Fixed in:5.4.0-146.163USN-5980-1

linux-image-awsUbuntu

Fixed in:4.4.0.1117.114USN-6013-1

Fixed in:4.4.0.1155.159USN-6001-1

Fixed in:5.4.0.1099.77USN-5985-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1153.136USN-5981-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1153.151USN-5984-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1099.96USN-5980-1

linux-image-azureUbuntu

Fixed in:4.15.0.1162.128USN-5924-1

Fixed in:4.15.0.1162.146USN-5975-1

Fixed in:5.4.0.1105.78USN-5985-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1162.130USN-5927-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1105.98USN-5980-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1060.55USN-6020-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1062.61USN-5984-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1147.137USN-6009-1

Fixed in:5.4.0.1102.78USN-5985-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1147.161USN-5991-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1102.104USN-5980-1

linux-image-genericUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.208.191USN-5984-1

Fixed in:5.4.0.146.144USN-5980-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.208.193USN-5981-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.208.191USN-5984-1

Fixed in:5.4.0.146.144USN-5980-1

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

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

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:4.15.0.1147.137USN-6009-1

Fixed in:5.4.0.1096.101USN-5980-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1096.101USN-5980-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1066.64USN-5980-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1066.64USN-5980-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1046.57USN-5985-1

Fixed in:5.4.0.1046.72USN-5980-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1046.72USN-5980-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1118.115USN-6014-1

Fixed in:4.15.0.1137.128USN-5984-1

Fixed in:5.4.0.1088.82USN-5980-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.208.191USN-5984-1

Fixed in:5.4.0.146.144USN-5980-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.208.193USN-5981-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

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:4.15.0.208.193USN-5981-1

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

Fixed in:5.4.0.146.144USN-5980-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

Fixed in:5.4.0.146.144USN-5980-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1116.97USN-5981-1

Fixed in:5.4.0.1098.107~18.04.70USN-5985-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1116.121USN-5984-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1098.91USN-5980-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1082.112USN-5980-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1082.79USN-5985-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1129.124USN-5984-1

Fixed in:5.4.0.1082.112USN-5980-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1148.147USN-6030-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

linux-image-virtualUbuntu

Fixed in:4.4.0.239.245USN-6014-1

Fixed in:4.15.0.208.191USN-5984-1

Fixed in:5.4.0.146.144USN-5980-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.208.193USN-5981-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.146.163~18.04.117USN-5985-1

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:4.15.0-1137.142USN-5984-1

Fixed in:5.4.0-1088.94USN-5980-1

linux-lts-xenialUbuntu

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

linux-oracleUbuntu

Fixed in:4.15.0-1116.127~16.04.1USN-5981-1

Fixed in:4.15.0-1116.127USN-5984-1

Fixed in:5.4.0-1098.107USN-5980-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1098.107~18.04.1USN-5985-1

linux-raspiUbuntu

Fixed in:5.4.0-1082.93USN-5980-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1082.93~18.04.1USN-5985-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1129.137USN-5984-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1148.158USN-6030-1

linux-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1023.27USN-6151-1

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

0.28%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Third-Party Advisory3

Issue Tracking1

bugzilla.redhat.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	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 2025-11-03.