BlackTreeIndependent security intelligence
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Full vulnerability report · 2022
CVE-2021-3669High confidence

A flaw was found in the Linux kernel

n/a · kernel

5.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 10 Sept 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-26961

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
01

What, why and how

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.

What

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.

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

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.

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Uncontrolled Resource Consumption → disrupt the affected service
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Denial of serviceCWE-400
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-W-2022-0515IBM Spectrum Protect: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in IBM Spectrum Protect ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, beliebigen Code auszuführen, seine Rechte zu erweitern oder beliebigen Code mit Root-Rechten auszuführen.

Official advisory
CERT-FR · French · CERTFR-2024-AVI-0872Multiples vulnérabilités dans le noyau Linux de Debian LTS

confidentialité des données Déni de service Élévation de privilèges Systèmes affectés Debian LTS bullseye versions antérieures à 5.10.226-1 Résumé De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian LTS. Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données et un déni de service. Solutions Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Debian LTS DLA-3912-1 du 07 octobre 2024 https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2022-48733 https://www.cve.org/CVERecord?id=CVE-2022-48733 Référence CVE CVE-2023-31083 https://www.cve.org/CVERecord?id=CVE-2023-31083 Référence CVE CVE-2023-52889 https://www.cve.org/CVERecord?id=CVE-2023-52889 Référence CVE CVE-2024-27397 https://www.cve.org/CVERecord?id=CVE-2024-27397 Référence CVE CVE-2024-38577 https://www.cve.org/CVERecord?id=CVE-2024-38577 Référence CVE CVE-2024-41011 https://www.cve.org/CVERecord?id=CVE-2024-41011 Référence CVE CVE-2024-41042 https://www.cve.org/CVERecord?id=CVE-2024-41042 Référence CVE CVE-2024-41098 https://www.cve.org/CVERecord?id=C

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0448Multiples vulnérabilités dans le noyau Linux d'Ubuntu

De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu . Certaines d'entre elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, une atteinte à l'intégrité des données et une exécution de code arbitraire.

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0333Multiples vulnérabilités dans le noyau Linux d'Ubuntu

otices/USN-6025-1 Bulletin de sécurité Ubuntu USN-6027-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6027-1 Bulletin de sécurité Ubuntu USN-6029-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6029-1 Bulletin de sécurité Ubuntu USN-6030-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6030-1 Bulletin de sécurité Ubuntu USN-6031-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6031-1 Bulletin de sécurité Ubuntu USN-6032-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6032-1 Bulletin de sécurité Ubuntu USN-6033-1 du 19 avril 2023 https://ubuntu.com/security/notices/USN-6033-1 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2022-21505 https://www.cve.org/CVERecord?id=CVE-2022-21505 Référence CVE CVE-2022-2196 https://www.cve.org/CVERecord?id=CVE-2022-2196 Référence CVE CVE-2022-3108 https://www.cve.org/CVERecord?id=CVE-2022-3108 Référence CVE CVE-2022-3424 https://www.cve.org/CVERecord?id=CVE-2022-3424 Référence CVE CVE-2022-36280 https://www.cve.org/CVERecord?id=CVE-2022-36280 Référence CVE CVE-2022-3903 https://www.cve.org/CVERecord?id=CVE-2022-3903 Référence CVE CVE-2022-41218 https://www.cve.org/CVERecord?id=CVE-2022-41218 Référence CVE CVE-2022-4129 https://www.cve.org/CVERecord?id=CVE-2022-4

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0315Multiples vulnérabilités dans le noyau Linux d'Ubuntu

lletin de sécurité Ubuntu USN-6014-1 du 12 avril 2023 https://ubuntu.com/security/notices/USN-6014-1 Référence CVE CVE-2020-36516 https://www.cve.org/CVERecord?id=CVE-2020-36516 Référence CVE CVE-2021-26401 https://www.cve.org/CVERecord?id=CVE-2021-26401 Référence CVE CVE-2021-28711 https://www.cve.org/CVERecord?id=CVE-2021-28711 Référence CVE CVE-2021-28712 https://www.cve.org/CVERecord?id=CVE-2021-28712 Référence CVE CVE-2021-28713 https://www.cve.org/CVERecord?id=CVE-2021-28713 Référence CVE CVE-2021-3428 https://www.cve.org/CVERecord?id=CVE-2021-3428 Référence CVE CVE-2021-3659 https://www.cve.org/CVERecord?id=CVE-2021-3659 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2021-3732 https://www.cve.org/CVERecord?id=CVE-2021-3732 Référence CVE CVE-2021-3772 https://www.cve.org/CVERecord?id=CVE-2021-3772 Référence CVE CVE-2021-4149 https://www.cve.org/CVERecord?id=CVE-2021-4149 Référence CVE CVE-2021-4203 https://www.cve.org/CVERecord?id=CVE-2021-4203 Référence CVE CVE-2021-45868 https://www.cve.org/CVERecord?id=CVE-2021-45868 Référence CVE CVE-2022-0487 https://www.cve.org/CVERecord?id=CVE-2022-0487 Référence CVE CVE-2022-0494 https://www.cve.org/CVERecord?id=CVE-2022-0494 Référence CVE CVE-2022-0617 https://www.cve.org/CVERecord?id=CVE-2022-0617

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0278Multiples vulnérabilités dans le noyau Linux d'Ubuntu

rity/notices/USN-5979-1 Bulletin de sécurité Ubuntu USN-5980-1 du 28 mars 2023 https://ubuntu.com/security/notices/USN-5980-1 Bulletin de sécurité Ubuntu USN-5981-1 du 28 mars 2023 https://ubuntu.com/security/notices/USN-5981-1 Bulletin de sécurité Ubuntu USN-5982-1 du 28 mars 2023 https://ubuntu.com/security/notices/USN-5982-1 Bulletin de sécurité Ubuntu USN-5984-1 du 29 mars 2023 https://ubuntu.com/security/notices/USN-5984-1 Bulletin de sécurité Ubuntu USN-5985-1 du 29 mars 2023 https://ubuntu.com/security/notices/USN-5985-1 Bulletin de sécurité Ubuntu USN-5987-1 du 29 mars 2023 https://ubuntu.com/security/notices/USN-5987-1 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2022-20369 https://www.cve.org/CVERecord?id=CVE-2022-20369 Référence CVE CVE-2022-2196 https://www.cve.org/CVERecord?id=CVE-2022-2196 Référence CVE CVE-2022-26373 https://www.cve.org/CVERecord?id=CVE-2022-26373 Référence CVE CVE-2022-2663 https://www.cve.org/CVERecord?id=CVE-2022-2663 Référence CVE CVE-2022-27672 https://www.cve.org/CVERecord?id=CVE-2022-27672 Référence CVE CVE-2022-29900 https://www.cve.org/CVERecord?id=CVE-2022-29900 Référence CVE CVE-2022-29901 https://www.cve.org/CVERecord?id=CVE-2022-29901 Référence CVE CVE-2022-3061 https://www.cve.org/CVERecord?id=CVE-20

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0210Multiples vulnérabilités dans le noyau Linux d'Ubuntu

rity/notices/USN-5929-1 Bulletin de sécurité Ubuntu USN-5934-1 du 07 mars 2023 https://ubuntu.com/security/notices/USN-5934-1 Bulletin de sécurité Ubuntu USN-5935-1 du 07 mars 2023 https://ubuntu.com/security/notices/USN-5935-1 Bulletin de sécurité Ubuntu USN-5938-1 du 08 mars 2023 https://ubuntu.com/security/notices/USN-5938-1 Bulletin de sécurité Ubuntu USN-5939-1 du 08 mars 2023 https://ubuntu.com/security/notices/USN-5939-1 Bulletin de sécurité Ubuntu USN-5940-1 du 09 mars 2023 https://ubuntu.com/security/notices/USN-5940-1 Bulletin de sécurité Ubuntu USN-5941-1 du 09 mars 2023 https://ubuntu.com/security/notices/USN-5941-1 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2021-4155 https://www.cve.org/CVERecord?id=CVE-2021-4155 Référence CVE CVE-2022-20369 https://www.cve.org/CVERecord?id=CVE-2022-20369 Référence CVE CVE-2022-20566 https://www.cve.org/CVERecord?id=CVE-2022-20566 Référence CVE CVE-2022-26373 https://www.cve.org/CVERecord?id=CVE-2022-26373 Référence CVE CVE-2022-2663 https://www.cve.org/CVERecord?id=CVE-2022-2663 Référence CVE CVE-2022-29900 https://www.cve.org/CVERecord?id=CVE-2022-29900 Référence CVE CVE-2022-29901 https://www.cve.org/CVERecord?id=CVE-2022-29901 Référence CVE CVE-2022-3169 https://www.cve.org/CVERecord?id=CVE-20

Official advisory
CERT-FR · French · CERTFR-2022-AVI-591Multiples vulnérabilités dans les produits IBM

CVERecord?id=CVE-2021-29650 Référence CVE CVE-2021-30465 https://www.cve.org/CVERecord?id=CVE-2021-30465 Référence CVE CVE-2021-3121 https://www.cve.org/CVERecord?id=CVE-2021-3121 Référence CVE CVE-2021-31525 https://www.cve.org/CVERecord?id=CVE-2021-31525 Référence CVE CVE-2021-31916 https://www.cve.org/CVERecord?id=CVE-2021-31916 Référence CVE CVE-2021-33194 https://www.cve.org/CVERecord?id=CVE-2021-33194 Référence CVE CVE-2021-3538 https://www.cve.org/CVERecord?id=CVE-2021-3538 Référence CVE CVE-2021-3573 https://www.cve.org/CVERecord?id=CVE-2021-3573 Référence CVE CVE-2021-3635 https://www.cve.org/CVERecord?id=CVE-2021-3635 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2021-3764 https://www.cve.org/CVERecord?id=CVE-2021-3764 Référence CVE CVE-2021-38201 https://www.cve.org/CVERecord?id=CVE-2021-38201 Référence CVE CVE-2021-4002 https://www.cve.org/CVERecord?id=CVE-2021-4002 Référence CVE CVE-2021-4028 https://www.cve.org/CVERecord?id=CVE-2021-4028 Référence CVE CVE-2021-4083 https://www.cve.org/CVERecord?id=CVE-2021-4083 Référence CVE CVE-2021-41190 https://www.cve.org/CVERecord?id=CVE-2021-41190 Référence CVE CVE-2021-4154 https://www.cve.org/CVERecord?id=CVE-2021-4154 Référence CVE CVE-2021-4155 https://www.cve.org/CVERecord?id=CVE-2021-415

Official advisory
CERT-FR · French · CERTFR-2021-AVI-797Multiples vulnérabilités dans le noyau Linux de SUSE

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service, une atteinte à l'intégrité des données et une atteinte à la confidentialité des données.

Official advisory
CERT-FR · French · CERTFR-2021-AVI-785Multiples vulnérabilités dans le noyau Linux de SUSE

g/CVERecord?id=CVE-2020-12770 Référence CVE CVE-2020-3702 https://www.cve.org/CVERecord?id=CVE-2020-3702 Référence CVE CVE-2021-31440 https://www.cve.org/CVERecord?id=CVE-2021-31440 Référence CVE CVE-2021-34556 https://www.cve.org/CVERecord?id=CVE-2021-34556 Référence CVE CVE-2021-35477 https://www.cve.org/CVERecord?id=CVE-2021-35477 Référence CVE CVE-2021-3573 https://www.cve.org/CVERecord?id=CVE-2021-3573 Référence CVE CVE-2021-3640 https://www.cve.org/CVERecord?id=CVE-2021-3640 Référence CVE CVE-2021-3653 https://www.cve.org/CVERecord?id=CVE-2021-3653 Référence CVE CVE-2021-3656 https://www.cve.org/CVERecord?id=CVE-2021-3656 Référence CVE CVE-2021-3669 https://www.cve.org/CVERecord?id=CVE-2021-3669 Référence CVE CVE-2021-3679 https://www.cve.org/CVERecord?id=CVE-2021-3679 Référence CVE CVE-2021-3715 https://www.cve.org/CVERecord?id=CVE-2021-3715 Référence CVE CVE-2021-3732 https://www.cve.org/CVERecord?id=CVE-2021-3732 Référence CVE CVE-2021-3739 https://www.cve.org/CVERecord?id=CVE-2021-3739 Référence CVE CVE-2021-3743 https://www.cve.org/CVERecord?id=CVE-2021-3743 Référence CVE CVE-2021-3744 https://www.cve.org/CVERecord?id=CVE-2021-3744 Référence CVE CVE-2021-3752 https://www.cve.org/CVERecord?id=CVE-2021-3752 Référence CVE CVE-2021-3753 https://www.cve.org/CVERecord?id=CVE-2021-3753 Ré

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
Not Known
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 26 Aug 2022 · Last source change 3 Nov 2025, 21:44 UTC · CWE-400 · Uncontrolled Resource Consumption

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-26961
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2021-26961↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-3669 · cve.blacktree.nl