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-2021-38604

CVE-2021-38604HIGH

n/a n/a — In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leadi…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0372   89.7     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Aug 12  Reserved by mitre
  Aug 12  Published (CNA: mitre)
  Oct 14  EXPLOIT PUBLISHED — CVE-2021-38604. Public exploit reference added.

CWE-476 · CNA: mitre · CVSS v3.1 · 10 references · NVD status: Modified

Description

In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 12, 2021	Reserved	Reserved by mitre
August 12, 2021	Published	Published (CNA: mitre)
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2021-38604. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-476

References (10)

https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibc [Exploit, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/html/ssa-831302.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/
https://security.gentoo.org/glsa/202208-24 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210909-0005/ [Third Party Advisory]
https://sourceware.org/bugzilla/show_bug.cgi?id=28213 [Issue Tracking, Patch, Third Party Advisory]
https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641
https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8
https://www.oracle.com/security-alerts/cpujul2022.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-38604 at cve.org

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-38604 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.