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Vulnerabilities

Vulnerability · CVE-2021-38604

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.

Published Aug 12, 2021 · catalog updated Oct 14, 2026 · In librt in the

Check if you run it

No confirmed exploitation is on record for CVE-2021-38604. EPSS is 3.72%. Act only if a listed version of In librt in the is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In librt in the).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.72%
Remediation
Advisory link
Affected products
cpe fedoraproject/fedora · cpe gnu/glibc · cpe oracle/communications cloud native core binding support function · cpe oracle/communications cloud native core network function cloud native environment · cpe oracle/communications cloud native core network repository function · cpe oracle/communications cloud native core security edge protection proxy

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fedoraproject/fedora35
  • cpe gnu/glibcversion unspecified
  • cpe oracle/communications cloud native core binding support function22.1.3
  • cpe oracle/communications cloud native core network function cloud native environment22.1.0
  • cpe oracle/communications cloud native core network repository function22.1.2
  • cpe oracle/communications cloud native core network repository function22.2.0
  • cpe oracle/communications cloud native core security edge protection proxy22.1.1
  • cpe oracle/communications cloud native core unified data repository22.2.0

How to fix CVE-2021-38604

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-38604. EPSS is 3.72%. Act only if a listed version of In librt in the is installed.

Which versions are affected?

Compare what you have installed with oracle/communications cloud native core binding support function 22.1.3; oracle/communications cloud native core network function cloud native environment 22.1.0; oracle/communications cloud native core network repository function 22.1.2; oracle/communications cloud native core network repository function 22.2.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 3.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 12, 2021 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2021-38604

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-38604

    30-day exploitation probability 3.7%

    first.org
  • NIST NVDVulnerability recordCVE-2021-38604

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.