CVE-2021-4204

HIGHNVD 7.17.1—

7.1

An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.

CVSS v3: 7.1
EG Score: 7.1(medium)
EPSS: 73.8%
KEV: Not listed

Published

August 24, 2022

Last Modified

November 21, 2024

References (10)

secalert@redhathttps://access.redhat.com/security/cve/CVE-2021-4204
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2039178
secalert@redhathttps://security-tracker.debian.org/tracker/CVE-2021-4204
secalert@redhathttps://security.netapp.com/advisory/ntap-20221228-0003/
secalert@redhathttps://www.openwall.com/lists/oss-security/2022/01/11/4
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2021-4204
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2039178
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2021-4204
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20221228-0003/
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2022/01/11/4

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-lowlatency (5.13.0.25.36) @ impish	2026-05-25	ubuntu
ubuntu	linux-image-5.13.0-1026-oem (5.13.0-1026.32) @ focal	2026-05-25	ubuntu
ubuntu	linux-oem-5.14-tools-5.14.0-1018 (5.14.0-1018.19) @ focal	2026-05-25	ubuntu
redhat	kernel-0:4.18.0-477.81.1.el8_8	2024-11-26	redhat
redhat	kernel-rt-0:4.18.0-553.rt7.342.el8_10	2024-05-22	redhat
redhat	kernel-0:4.18.0-553.el8_10	2024-05-22	redhat
redhat	kernel-0:4.18.0-372.91.1.el8_6	2024-02-07	redhat

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(3)

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

All Vendor Advisories

(7)

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 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-4204?

CVE-2021-4204 is a high vulnerability published on August 24, 2022. An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.

When was CVE-2021-4204 disclosed?

CVE-2021-4204 was first published in the National Vulnerability Database on August 24, 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-2021-4204 actively exploited?

CVE-2021-4204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-4204?

CVE-2021-4204 has a CVSS v3 base score of 7.1 (NVD).

How do I remediate CVE-2021-4204?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4204, 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-2021-4204

Published

Last Modified

References (10)

Patch Availability(7)

Weakness Classification(3)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-4204?

Same vendor

Same CWE

CVE-2021-4204

📅 Published

🔄 Last Modified

🔗 References (10)

Patch Availability(7)

Weakness Classification(3)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-4204?

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References (10)

Frequently asked(5)

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