CVE-2021-47320

MEDIUMNVD 5.55.5—

5.5

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.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 0.7%
KEV: Not listed

Published

May 21, 2024

Last Modified

December 24, 2024

References (18)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0704f617040c397ae73c1f88f3956787ec5d6529
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fcb6fcd74a222d9ead54d405842fc763bb86262
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e3960f276b4574a9bb0dfa31a7497302f6363b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b515308ab875c7e8ada8e606fe0c64762da5ed4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/687cf32865b2d6960214bce523f2afac58dd3cd2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a2b308a54c5ec224fedc753617f99b29ffcd883
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8fc86e9df6a6a03f5a8e15a3b7a5c75fd05aa38
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cef9d9acb7c80ed6bace894b6334557fd493863b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0b32dc1409f7e65e4fcc34e236462268e69a357
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0704f617040c397ae73c1f88f3956787ec5d6529
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1fcb6fcd74a222d9ead54d405842fc763bb86262
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2e3960f276b4574a9bb0dfa31a7497302f6363b2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4b515308ab875c7e8ada8e606fe0c64762da5ed4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/687cf32865b2d6960214bce523f2afac58dd3cd2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8a2b308a54c5ec224fedc753617f99b29ffcd883

Patch Availability(2)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-virtual-lts-xenial (4.4.0.267.301~14.04.1) @ trusty	2026-05-24	ubuntu
ubuntu	linux-tools-fips (4.4.0.1112.113) @ xenial	2026-05-24	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 01:34 UTCEG score recompute
2026-05-24 01:34 UTCVendor advisory
2026-05-24 01:34 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-47320?

CVE-2021-47320 is a medium vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posixaclcreate() When looking into another nfs xfstests report, I found acl and defaultacl in nfs3proccreate() and nfs3proc_mknod() error paths are possibly leaked. Fix them in advance.

When was CVE-2021-47320 disclosed?

CVE-2021-47320 was first published in the National Vulnerability Database on May 21, 2024, with the most recent update on December 24, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-47320 actively exploited?

CVE-2021-47320 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-47320?

CVE-2021-47320 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-47320?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47320, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-47320

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CVE-2021-47320

Published

Last Modified

References (18)

Patch Availability(2)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-47320?

Same vendor

Same CWE

CVE-2021-47320

📅 Published

🔄 Last Modified

🔗 References (18)

Patch Availability(2)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-47320?

🔗 Related CVEs(same vendor + same CWE)

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Published

Last Modified

References (18)

Frequently asked(5)

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