CVE-2021-47116

MEDIUMNVD 5.55.5—

5.5

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix memory leak in ext4_mb_init_backend on error path.

Fix a memory leak discovered by syzbot when a file system is corrupted with an illegally large s_log_groups_per_flex.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 4.8%
KEV: Not listed

Published

March 15, 2024

Last Modified

January 7, 2025

References (6)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5

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)

Data Freshness Timeline

(refreshed 10× 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
2026-05-29 13:42 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 06:39 UTCEG score recompute
2026-05-24 06:39 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-47116?

CVE-2021-47116 is a medium vulnerability published on March 15, 2024. In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4mbinit_backend on error path. Fix a memory leak discovered by syzbot when a file system is corrupted with an illegally large sloggroupsperflex.

When was CVE-2021-47116 disclosed?

CVE-2021-47116 was first published in the National Vulnerability Database on March 15, 2024, with the most recent update on January 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-47116 actively exploited?

CVE-2021-47116 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-47116?

CVE-2021-47116 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-47116?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47116, 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

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CVE-2021-47116

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-47116?

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Published

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References (6)

Frequently asked(5)

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