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Full vulnerability report · 2022
CVE-2021-4157High confidence

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS)

n/a · kernel

8.0HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

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-2021-34025

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 actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

What

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

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

What

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

An attacker operating through the affected interface 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
the affected interface → Improper Restriction of Operations within the Bounds of a Memory Buffer → disrupt the affected service
Attack surface
Unspecified
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-119

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer. The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

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

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

AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.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.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
Denial of serviceCWE-119
A

Official authority intelligence

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

BSI · German · WID-SEC-W-2024-0794Dell ECS: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell ECS ausnutzen, um seine Privilegien zu erweitern, beliebigen Programmcode mit Administratorrechten auszuführen, Informationen offenzulegen, Dateien zu manipulieren, einen Cross-Site-Scripting-Angriff durchzuführen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.

Official advisory
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-2022-AVI-748Multiples vulnérabilités dans le noyau Linux de SUSE

é SUSE suse-su-20222809-1 du 15 août 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222809-1/ Bulletin de sécurité SUSE suse-su-20222827-1 du 16 août 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222827-1/ Référence CVE CVE-2020-36557 https://www.cve.org/CVERecord?id=CVE-2020-36557 Référence CVE CVE-2020-36558 https://www.cve.org/CVERecord?id=CVE-2020-36558 Référence CVE CVE-2021-26341 https://www.cve.org/CVERecord?id=CVE-2021-26341 Référence CVE CVE-2021-33655 https://www.cve.org/CVERecord?id=CVE-2021-33655 Référence CVE CVE-2021-33656 https://www.cve.org/CVERecord?id=CVE-2021-33656 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2022-1116 https://www.cve.org/CVERecord?id=CVE-2022-1116 Référence CVE CVE-2022-1462 https://www.cve.org/CVERecord?id=CVE-2022-1462 Référence CVE CVE-2022-1679 https://www.cve.org/CVERecord?id=CVE-2022-1679 Référence CVE CVE-2022-20132 https://www.cve.org/CVERecord?id=CVE-2022-20132 Référence CVE CVE-2022-20141 https://www.cve.org/CVERecord?id=CVE-2022-20141 Référence CVE CVE-2022-20154 https://www.cve.org/CVERecord?id=CVE-2022-20154 Référence CVE CVE-2022-20166 https://www.cve.org/CVERecord?id=CVE-2022-20166 Référence CVE CVE-2022-21505 https://www.cve.org/CVERecord?id=CVE-202

Official advisory
CERT-FR · French · CERTFR-2022-AVI-710Multiples vulnérabilités dans le noyau Linux de SUSE

érer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité SUSE suse-su-20222629-1 du 4 août 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222629-1/ Référence CVE CVE-2019-19377 https://www.cve.org/CVERecord?id=CVE-2019-19377 Référence CVE CVE-2020-26541 https://www.cve.org/CVERecord?id=CVE-2020-26541 Référence CVE CVE-2021-26341 https://www.cve.org/CVERecord?id=CVE-2021-26341 Référence CVE CVE-2021-33061 https://www.cve.org/CVERecord?id=CVE-2021-33061 Référence CVE CVE-2021-39711 https://www.cve.org/CVERecord?id=CVE-2021-39711 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2022-1012 https://www.cve.org/CVERecord?id=CVE-2022-1012 Référence CVE CVE-2022-1184 https://www.cve.org/CVERecord?id=CVE-2022-1184 Référence CVE CVE-2022-1652 https://www.cve.org/CVERecord?id=CVE-2022-1652 Référence CVE CVE-2022-1679 https://www.cve.org/CVERecord?id=CVE-2022-1679 Référence CVE CVE-2022-1729 https://www.cve.org/CVERecord?id=CVE-2022-1729 Référence CVE CVE-2022-1734 https://www.cve.org/CVERecord?id=CVE-2022-1734 Référence CVE CVE-2022-1836 https://www.cve.org/CVERecord?id=CVE-2022-1836 Référence CVE CVE-2022-1966 https://www.cve.org/CVERecord?id=CVE-2022-1966 Ré

Official advisory
CERT-FR · French · CERTFR-2022-AVI-688Multiples 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 problème de sécurité non spécifié par l'éditeur, un déni de service et un contournement de la politique de sécurité.

Official advisory
CERT-FR · French · CERTFR-2022-AVI-670Multiples vulnérabilités dans le noyau Linux de SUSE

upport/update/announcement/2022/suse-su-20222515-1/ Bulletin de sécurité SUSE suse-su-20222516-1 du 21 juillet 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222516-1/ Bulletin de sécurité SUSE suse-su-20222520-1 du 21 juillet 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222520-1/ Référence CVE CVE-2017-16525 https://www.cve.org/CVERecord?id=CVE-2017-16525 Référence CVE CVE-2021-26341 https://www.cve.org/CVERecord?id=CVE-2021-26341 Référence CVE CVE-2021-33061 https://www.cve.org/CVERecord?id=CVE-2021-33061 Référence CVE CVE-2021-39698 https://www.cve.org/CVERecord?id=CVE-2021-39698 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2021-4204 https://www.cve.org/CVERecord?id=CVE-2021-4204 Référence CVE CVE-2021-44879 https://www.cve.org/CVERecord?id=CVE-2021-44879 Référence CVE CVE-2021-45402 https://www.cve.org/CVERecord?id=CVE-2021-45402 Référence CVE CVE-2022-0264 https://www.cve.org/CVERecord?id=CVE-2022-0264 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 Référence CVE CVE-2022-1012 https://www.cve.org/CVERecord?id=CVE-2022-1012 Référence CVE CVE-2022-1016 https://www.cve.org/CVERecord?id=CVE-2022-101

Official advisory
CERT-FR · French · CERTFR-2022-AVI-652Multiples 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 une exécution de code arbitraire, un déni de service et une atteinte à la confidentialité des données.

Official advisory
CERT-FR · French · CERTFR-2022-AVI-644Multiples vulnérabilités dans le noyau Linux de SUSE

upport/update/announcement/2022/suse-su-20222379-1/ Bulletin de sécurité SUSE suse-su-20222382-1 du 13 juillet 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222382-1/ Bulletin de sécurité SUSE suse-su-20222393-1 du 14 juillet 2022 https://www.suse.com/support/update/announcement/2022/suse-su-20222393-1/ Référence CVE CVE-2017-16525 https://www.cve.org/CVERecord?id=CVE-2017-16525 Référence CVE CVE-2019-19377 https://www.cve.org/CVERecord?id=CVE-2019-19377 Référence CVE CVE-2020-26541 https://www.cve.org/CVERecord?id=CVE-2020-26541 Référence CVE CVE-2021-26341 https://www.cve.org/CVERecord?id=CVE-2021-26341 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2022-1012 https://www.cve.org/CVERecord?id=CVE-2022-1012 Référence CVE CVE-2022-1184 https://www.cve.org/CVERecord?id=CVE-2022-1184 Référence CVE CVE-2022-1679 https://www.cve.org/CVERecord?id=CVE-2022-1679 Référence CVE CVE-2022-1729 https://www.cve.org/CVERecord?id=CVE-2022-1729 Référence CVE CVE-2022-1974 https://www.cve.org/CVERecord?id=CVE-2022-1974 Référence CVE CVE-2022-1975 https://www.cve.org/CVERecord?id=CVE-2022-1975 Référence CVE CVE-2022-20132 https://www.cve.org/CVERecord?id=CVE-2022-20132 Référence CVE CVE-2022-20141 https://www.cve.org/CVERecord?id=CVE-2022-2014

Official advisory
CERT-FR · French · CERTFR-2022-AVI-629Multiples 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 problème de sécurité non spécifié par l'éditeur, un déni de service et un contournement de la politique de sécurité.

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

.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-2021-4155 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2021-41864 https://www.cve.org/CVERecord?id=CVE-2021-41864 Référence CVE CVE-2021-4197 https://www.cve.org/CVERecord?id=CVE-2021-4197 Référence CVE CVE-2021-4203 https://www.cve.org/CVERecord?id=CVE-2021-4203 Référence CVE CVE-2021-42248 https://www.cve.org/CVERecord?id=CVE-2021-42248 Référence CVE CVE-2021-42836 https://www.cve.org/CVERecord?id=CVE-2021-42836 Référence CVE CVE-2021-43565 https://www.cve.org/CVERecord?id=CVE-2021-43565 Référence CVE CVE-2021-43784 https://www.cve.org/CVERecord?id=CVE-2021-43784 Référence CVE CVE-2021-44716 https://www.cve.org/CVERecord?id=CVE-2

Official advisory
CERT-FR · French · CERTFR-2022-AVI-452Multiples vulnérabilités dans le noyau Linux d'Ubuntu

Bulletin de sécurité Ubuntu USN-5415-1 du 11 mai 2022 https://ubuntu.com/security/notices/USN-5415-1 Bulletin de sécurité Ubuntu USN-5416-1 du 11 mai 2022 https://ubuntu.com/security/notices/USN-5416-1 Bulletin de sécurité Ubuntu USN-5417-1 du 11 mai 2022 https://ubuntu.com/security/notices/USN-5417-1 Bulletin de sécurité Ubuntu USN-5418-1 du 11 mai 2022 https://ubuntu.com/security/notices/USN-5418-1 Référence CVE CVE-2020-27820 https://www.cve.org/CVERecord?id=CVE-2020-27820 Référence CVE CVE-2021-26401 https://www.cve.org/CVERecord?id=CVE-2021-26401 Référence CVE CVE-2021-39713 https://www.cve.org/CVERecord?id=CVE-2021-39713 Référence CVE CVE-2021-4157 https://www.cve.org/CVERecord?id=CVE-2021-4157 Référence CVE CVE-2022-1016 https://www.cve.org/CVERecord?id=CVE-2022-1016 Référence CVE CVE-2022-1158 https://www.cve.org/CVERecord?id=CVE-2022-1158 Référence CVE CVE-2022-1516 https://www.cve.org/CVERecord?id=CVE-2022-1516 Référence CVE CVE-2022-20008 https://www.cve.org/CVERecord?id=CVE-2022-20008 Référence CVE CVE-2022-23036 https://www.cve.org/CVERecord?id=CVE-2022-23036 Référence CVE CVE-2022-23037 https://www.cve.org/CVERecord?id=CVE-2022-23037 Référence CVE CVE-2022-23038 https://www.cve.org/CVERecord?id=CVE-2022-23038 Référence CVE CVE-2022-23039 https://www.cve.org/CVERecord?id=CVE-202

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
kernel 5.13-rc1
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 25 Mar 2022 · Last source change 3 Aug 2024, 17:16 UTC · CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVE recordCVE.org · 5.1
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-2021-34025
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
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-2021-4157 · cve.blacktree.nl