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 3.1

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

EPSS

3.7% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2021-08-12

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• fedoraproject:fedora
• gnu:glibc
• oracle:communications_cloud_native_core_binding_support_function
• oracle:communications_cloud_native_core_network_function_cloud_native_environment
• oracle:communications_cloud_native_core_network_repository_function
• oracle:communications_cloud_native_core_security_edge_protection_proxy
• oracle:communications_cloud_native_core_unified_data_repository
• oracle:enterprise_operations_monitor

References

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

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