CVE-2021-3759

Name: CVE-2021-3759
Creator: NVD / NIST
Published: 2022-08-23T16:15:09.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2021-3759 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resources, causing a denial of service. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the semget function multiple times, creating semaphores. This flaw allows a local user to starve the resources, causing a denial of service. The highest threat from this vulnerability is to system availability.

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

0.34%

26.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	All versions
Debian	Debian Linux	10.0

References

https://access.redhat.com/security/cve/CVE-2021-3759Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1999675Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00031.htmlMailing List, Third Party Advisory
https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/
https://access.redhat.com/security/cve/CVE-2021-3759Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1999675Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00031.htmlMailing List, Third Party Advisory
https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/

Timeline

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

Frequently Asked Questions

What is CVE-2021-3759?

How severe is CVE-2021-3759?

CVE-2021-3759 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3759?

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-2021-3759?

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

Scan your code now

Source: NVD / NIST