CVE-2021-4002

Name: CVE-2021-4002
Creator: NVD / NIST
Published: 2022-03-03T22:15:08.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2021-4002 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

Metrics

CVSS 3.1

4.4/10

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

EPSS Probability

0.52%

40.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.16
Linux	Linux Kernel	5.16
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	35
Oracle	Communications Cloud Native Core Binding Support Function	22.1.3
Oracle	Communications Cloud Native Core Network Exposure Function	22.1.1
Oracle	Communications Cloud Native Core Policy	22.2.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=2025726Issue Tracking, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7eaPatch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/11/25/1Exploit, Mailing List, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025726Issue Tracking, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7eaPatch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/11/25/1Exploit, Mailing List, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory

Timeline

Published: Mar 3, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4002?

How severe is CVE-2021-4002?

CVE-2021-4002 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4002?

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-2021-4002?

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

Scan your code now

Source: NVD / NIST