---
id: CVE-2021-3759
title: >-
  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
summary: >-
  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 resour…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-770
vendor: linux
product: linux_kernel
affected:
  - linux_kernel
  - debian_linux = 10.0
published: '2022-08-23'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:48.563'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-3759'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2021-3759'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1999675'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html'
    label: secalert@redhat.com
  - url: >-
      https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2021-3759'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1999675'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.0036
epssPercentile: 0.27954
ingestedAt: '2026-10-14T10:25:41.193Z'
---

## Overview

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.

## Affected

- `linux_kernel`
- `debian_linux = 10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.