What is CVE-2021-3669?

CVE-2021-3669 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Uncontrolled Resource Consumption flaw (CWE-400). CVE-2021-3669 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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

CVE-2021-3669 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-3669?

No patch is currently available for CVE-2021-3669. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-3669 actively exploited?

CVE-2021-3669 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/400.html

CVE-2021-3669

Medium

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.

Package Linux Kernel

Published 2022-08-26

Last modified 2025-11-03

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-400

CVE-2021-3669 is a Uncontrolled Resource Consumption vulnerability

What is Uncontrolled Resource Consumption?

The product does not properly control the amount of resources it consumes, leading to exhaustion. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-3669 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Red Hat
https://access.redhat.com/security/cve/CVE-2021-3669

Issue Tracking Third Party Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1980619

Issue Tracking Third Party Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1986473

Issue Tracking Permissions Required
Debian Security
https://security-tracker.debian.org/tracker/CVE-2021-3669

Issue Tracking Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html

Details

CVE ID CVE-2021-3669

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2022-08-26

Modified 2025-11-03

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-3669?

CVE-2021-3669 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Uncontrolled Resource Consumption flaw (CWE-400) . CVE-2021-3669 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-3669?

CVE-2021-3669 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-3669?

No patch is currently available for CVE-2021-3669. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-3669 actively exploited?

No — CVE-2021-3669 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. View CWE-400 on MITRE CWE →