CVE-2021-4148

MEDIUMNVD 5.55.5—

5.5

A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 4.6%
KEV: Not listed

Published

March 23, 2022

Last Modified

November 21, 2024

References (6)

secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2026487
secalert@redhathttps://lkml.org/lkml/2021/9/12/323
secalert@redhathttps://lkml.org/lkml/2021/9/17/1037
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2026487
af854a3a-2127-422b-91ae-364da2661108https://lkml.org/lkml/2021/9/12/323
af854a3a-2127-422b-91ae-364da2661108https://lkml.org/lkml/2021/9/17/1037

Weakness Classification(1)

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

CWE-354Improper Validation of Integrity Check Value

All Vendor Advisories

(1)

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.

Microsoft MSRCCVE-2021-41482022-03-31
A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem.

Data Freshness Timeline

(refreshed 10× in last 7d / 19× 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
2026-05-26 01:09 UTCEG score recompute
2026-05-26 01:09 UTCVendor advisory
2026-05-26 01:09 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-4148?

CVE-2021-4148 is a medium vulnerability published on March 23, 2022. A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem.

When was CVE-2021-4148 disclosed?

CVE-2021-4148 was first published in the National Vulnerability Database on March 23, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-4148 actively exploited?

CVE-2021-4148 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-4148?

CVE-2021-4148 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-4148?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4148, 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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