CVE-2021-4148

Name: CVE-2021-4148
Creator: NVD / NIST
Published: 2022-03-23T20:15:09.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2021-4148 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

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.

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

0.31%

22.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.14.16
Fedoraproject	Fedora	35

References

https://bugzilla.redhat.com/show_bug.cgi?id=2026487Issue Tracking, Third Party Advisory
https://lkml.org/lkml/2021/9/12/323Exploit, Mailing List, Patch, Third Party Advisory
https://lkml.org/lkml/2021/9/17/1037Exploit, Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2026487Issue Tracking, Third Party Advisory
https://lkml.org/lkml/2021/9/12/323Exploit, Mailing List, Patch, Third Party Advisory
https://lkml.org/lkml/2021/9/17/1037Exploit, Mailing List, Patch, Third Party Advisory

Timeline

Published: Mar 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4148?

How severe is CVE-2021-4148?

CVE-2021-4148 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4148?

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-2021-4148?

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

Scan your code now

Source: NVD / NIST