BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2024
CVE-2021-47320High confidence

nfs: fix acl memory leak of posix_acl_create()

Linux · Linux

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.

Patch available
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 11 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-2021-34325

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.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posix_acl_create() When looking into another nfs xfstests report, I found acl and default_acl in nfs3_proc_create() and nfs3_proc_mknod() error paths are possibly leaked. Fix them in advance.

What

In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posix_acl_create() When looking into another nfs xfstests report, I found acl and default_acl in nfs3_proc_create() and nfs3_proc_mknod() error paths are possibly leaked. Fix them in advance.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posix_acl_create() When looking into another nfs xfstests report, I found acl and default_acl in nfs3_proc_create() and nfs3_proc_mknod() error paths are possibly leaked. Fix them in advance.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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 → Missing Release of Memory after Effective Lifetime → cause the confidentiality, integrity or availability impact described by the vendor
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-401

CWE-401: Missing Release of Memory after Effective Lifetime. The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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.
CWE-401
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2025-AVI-0308Multiples vulnérabilités dans le noyau Linux d'Ubuntu

notices/USN-7428-1 Bulletin de sécurité Ubuntu USN-7428-2 du 09 avril 2025 https://ubuntu.com/security/notices/USN-7428-2 Bulletin de sécurité Ubuntu USN-7429-1 du 09 avril 2025 https://ubuntu.com/security/notices/USN-7429-1 Bulletin de sécurité Ubuntu USN-7429-2 du 09 avril 2025 https://ubuntu.com/security/notices/USN-7429-2 Référence CVE CVE-2021-47101 https://www.cve.org/CVERecord?id=CVE-2021-47101 Référence CVE CVE-2021-47119 https://www.cve.org/CVERecord?id=CVE-2021-47119 Référence CVE CVE-2021-47122 https://www.cve.org/CVERecord?id=CVE-2021-47122 Référence CVE CVE-2021-47235 https://www.cve.org/CVERecord?id=CVE-2021-47235 Référence CVE CVE-2021-47320 https://www.cve.org/CVERecord?id=CVE-2021-47320 Référence CVE CVE-2021-47483 https://www.cve.org/CVERecord?id=CVE-2021-47483 Référence CVE CVE-2021-47602 https://www.cve.org/CVERecord?id=CVE-2021-47602 Référence CVE CVE-2022-23041 https://www.cve.org/CVERecord?id=CVE-2022-23041 Référence CVE CVE-2022-49034 https://www.cve.org/CVERecord?id=CVE-2022-49034 Référence CVE CVE-2024-26863 https://www.cve.org/CVERecord?id=CVE-2024-26863 Référence CVE CVE-2024-26921 https://www.cve.org/CVERecord?id=CVE-2024-26921 Référence CVE CVE-2024-26928 https://www.cve.org/CVERecord?id=CVE-2024-26928 Référence CVE CVE-2024-35864 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0526Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2021-47302 Référence CVE CVE-2021-47305 https://www.cve.org/CVERecord?id=CVE-2021-47305 Référence CVE CVE-2021-47307 https://www.cve.org/CVERecord?id=CVE-2021-47307 Référence CVE CVE-2021-47308 https://www.cve.org/CVERecord?id=CVE-2021-47308 Référence CVE CVE-2021-47310 https://www.cve.org/CVERecord?id=CVE-2021-47310 Référence CVE CVE-2021-47311 https://www.cve.org/CVERecord?id=CVE-2021-47311 Référence CVE CVE-2021-47314 https://www.cve.org/CVERecord?id=CVE-2021-47314 Référence CVE CVE-2021-47315 https://www.cve.org/CVERecord?id=CVE-2021-47315 Référence CVE CVE-2021-47319 https://www.cve.org/CVERecord?id=CVE-2021-47319 Référence CVE CVE-2021-47320 https://www.cve.org/CVERecord?id=CVE-2021-47320 Référence CVE CVE-2021-47321 https://www.cve.org/CVERecord?id=CVE-2021-47321 Référence CVE CVE-2021-47323 https://www.cve.org/CVERecord?id=CVE-2021-47323 Référence CVE CVE-2021-47324 https://www.cve.org/CVERecord?id=CVE-2021-47324 Référence CVE CVE-2021-47329 https://www.cve.org/CVERecord?id=CVE-2021-47329 Référence CVE CVE-2021-47330 https://www.cve.org/CVERecord?id=CVE-2021-47330 Référence CVE CVE-2021-47332 https://www.cve.org/CVERecord?id=CVE-2021-47332 Référence CVE CVE-2021-47333 https://www.cve.org/CVERecord?id=CVE-2021-47333 Référence CVE CVE-2021-47334 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0496Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2021-47302 Référence CVE CVE-2021-47305 https://www.cve.org/CVERecord?id=CVE-2021-47305 Référence CVE CVE-2021-47307 https://www.cve.org/CVERecord?id=CVE-2021-47307 Référence CVE CVE-2021-47308 https://www.cve.org/CVERecord?id=CVE-2021-47308 Référence CVE CVE-2021-47310 https://www.cve.org/CVERecord?id=CVE-2021-47310 Référence CVE CVE-2021-47311 https://www.cve.org/CVERecord?id=CVE-2021-47311 Référence CVE CVE-2021-47314 https://www.cve.org/CVERecord?id=CVE-2021-47314 Référence CVE CVE-2021-47315 https://www.cve.org/CVERecord?id=CVE-2021-47315 Référence CVE CVE-2021-47319 https://www.cve.org/CVERecord?id=CVE-2021-47319 Référence CVE CVE-2021-47320 https://www.cve.org/CVERecord?id=CVE-2021-47320 Référence CVE CVE-2021-47321 https://www.cve.org/CVERecord?id=CVE-2021-47321 Référence CVE CVE-2021-47323 https://www.cve.org/CVERecord?id=CVE-2021-47323 Référence CVE CVE-2021-47324 https://www.cve.org/CVERecord?id=CVE-2021-47324 Référence CVE CVE-2021-47329 https://www.cve.org/CVERecord?id=CVE-2021-47329 Référence CVE CVE-2021-47330 https://www.cve.org/CVERecord?id=CVE-2021-47330 Référence CVE CVE-2021-47332 https://www.cve.org/CVERecord?id=CVE-2021-47332 Référence CVE CVE-2021-47333 https://www.cve.org/CVERecord?id=CVE-2021-47333 Référence CVE CVE-2021-47334 https://www.cve.org/CVERecord?id=

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.
Patch available
Affected
Linux: 013cdf1088d7235da9477a2375654921d9b9ba9f < 2e3960f276b4574a9bb0dfa31a7497302f6363b2, 013cdf1088d7235da9477a2375654921d9b9ba9f < cef9d9acb7c80ed6bace894b6334557fd493863b, 013cdf1088d7235da9477a2375654921d9b9ba9f < 8a2b308a54c5ec224fedc753617f99b29ffcd883, 013cdf1088d7235da9477a2375654921d9b9ba9f < 0704f617040c397ae73c1f88f3956787ec5d6529, 013cdf1088d7235da9477a2375654921d9b9ba9f < d0b32dc1409f7e65e4fcc34e236462268e69a357, 013cdf1088d7235da9477a2375654921d9b9ba9f < 4b515308ab875c7e8ada8e606fe0c64762da5ed4, 013cdf1088d7235da9477a2375654921d9b9ba9f < c8fc86e9df6a6a03f5a8e15a3b7a5c75fd05aa38, 013cdf1088d7235da9477a2375654921d9b9ba9f < 687cf32865b2d6960214bce523f2afac58dd3cd2, 013cdf1088d7235da9477a2375654921d9b9ba9f < 1fcb6fcd74a222d9ead54d405842fc763bb86262, 3.14
Fixed
Linux: < 3.14, 4.4.276 ≤ 4.4.*, 4.9.276 ≤ 4.9.*, 4.14.240 ≤ 4.14.*, 4.19.198 ≤ 4.19.*, 5.4.134 ≤ 5.4.*, 5.10.52 ≤ 5.10.*, 5.12.19 ≤ 5.12.*, 5.13.4 ≤ 5.13.*, 5.14 ≤ *
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 21 May 2024 · Last source change 11 May 2026, 13:52 UTC · CWE-401 · Missing Release of Memory after Effective Lifetime

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-2021-34325
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD enriched

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-2021-47320 · cve.blacktree.nl