CVE-2021-3428

Name: CVE-2021-3428
Creator: NVD / NIST
Published: 2022-03-04T18:15:08.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2021-3428 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the Linux kernel. A denial of service problem is identified if an extent tree is corrupted in a crafted ext4 filesystem in fs/ext4/extents.c in ext4_es_cache_extent. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

A flaw was found in the Linux kernel. A denial of service problem is identified if an extent tree is corrupted in a crafted ext4 filesystem in fs/ext4/extents.c in ext4_es_cache_extent. Fabricating an integer overflow, A local attacker with a special user privilege may cause a system crash problem which can lead to an availability threat.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.29%

20.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.9.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1972621Issue Tracking, Permissions Required, Third Party Advisory
https://ubuntu.com/security/CVE-2021-3428Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/17/1Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1972621Issue Tracking, Permissions Required, Third Party Advisory
https://ubuntu.com/security/CVE-2021-3428Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/17/1Mailing List, Third Party Advisory

Timeline

Published: Mar 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3428?

How severe is CVE-2021-3428?

CVE-2021-3428 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3428?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3428?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST