Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-3759

CVE-2021-3759MEDIUM

n/a kernel — A memory overflow vulnerability was found in the Linux kernel’s ipc functionality of the memcg subsystem, in the way a user calls the sem…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  N  N  H    5.5   .0036   28.7     —

AFFECTED
  Product  Versions                          Fixed
  kernel   Fixed in Linux kernel 5.15-rc1 –  —

TIMELINE
  Sep 1   Reserved by redhat
  Aug 23  Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-3759 (kernel). Received CVSS 5.5 and CPE data from NVD.

CWE-770, CWE-400 · CNA: redhat · CVSS v3.1 · 5 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 1, 2021	Reserved	Reserved by redhat
August 23, 2022	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-3759 (kernel). Received CVSS 5.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	kernel	—	Fixed in Linux kernel 5.15-rc1	—

Weaknesses

CWE-770 · CWE-400

References (5)

https://access.redhat.com/security/cve/CVE-2021-3759 [Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=1999675 [Issue Tracking, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-794697.html
https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html [Mailing List, Third Party Advisory]
https://lore.kernel.org/linux-mm/1626333284-1404-1-git-send-email-nglaive%40gmail.com/

Authoritative record: CVE-2021-3759 at cve.org

Weaknesses: CWE-770 · CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3759 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.