CVE-2021-38604

Name: CVE-2021-38604
Creator: NVD / NIST
Published: 2021-08-12T16:15:10.6+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.04%

Last modified Jun 17, 2026

CVE-2021-38604 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.04% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.04%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gnu	Glibc	<= 2.34
Fedoraproject	Fedora	35
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
Oracle	Communications Cloud Native Core Security Edge Protection Proxy	22.1.1
Oracle	Communications Cloud Native Core Unified Data Repository	22.2.0
Oracle	Enterprise Operations Monitor	4.3
Oracle	Enterprise Operations Monitor	4.4
Oracle	Enterprise Operations Monitor	5.0

References

https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibcExploit, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/
https://security.gentoo.org/glsa/202208-24Third Party Advisory
https://security.netapp.com/advisory/ntap-20210909-0005/Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=28213Issue 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.htmlPatch, Third Party Advisory
https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibcExploit, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/
https://security.gentoo.org/glsa/202208-24Third Party Advisory
https://security.netapp.com/advisory/ntap-20210909-0005/Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=28213Issue 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.htmlPatch, Third Party Advisory

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38604?

How severe is CVE-2021-38604?

CVE-2021-38604 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38604?

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-2021-38604?

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

Scan your code now

Source: NVD / NIST