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. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.

CVSS v3.1 NVD

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

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS

3.72% chance of exploitation in the next 30 days, 90th percentile

Published

2021-08-12

Updated

2026-10-14

Proof-of-concept exploits (1)

• https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-i…

Security advisories

• https://security.gentoo.org/glsa/202208-24
• https://security.netapp.com/advisory/ntap-20210909-0005
• https://sourceware.org/bugzilla/show_bug.cgi?id=28213
• https://www.oracle.com/security-alerts/cpujul2022.html

References

• CVE Record
• NVD entry