CVE-2021-38604In 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.
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 10 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
gnu glibc gnu:glibc | through 2.34 | NVD |
fedoraproject fedora fedoraproject:fedora | 35 | NVD |
oracle communications_cloud_native_core_binding_support_function oracle:communications_cloud_native_core_binding_support_function | 22.1.3 | NVD |
oracle communications_cloud_native_core_network_function_cloud_native_environment oracle:communications_cloud_native_core_network_function_cloud_native_environment | 22.1.0 | NVD |
oracle communications_cloud_native_core_network_repository_function oracle:communications_cloud_native_core_network_repository_function | 22.1.2; 22.2.0 | NVD |
oracle communications_cloud_native_core_security_edge_protection_proxy oracle:communications_cloud_native_core_security_edge_protection_proxy | 22.1.1 | NVD |
oracle communications_cloud_native_core_unified_data_repository oracle:communications_cloud_native_core_unified_data_repository | 22.2.0 | NVD |
oracle enterprise_operations_monitor oracle:enterprise_operations_monitor | 4.3; 4.4; 5.0 | NVD |
References
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8x-refsource-misc
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641x-refsource-misc
- https://sourceware.org/bugzilla/show_bug.cgi?id=28213x-refsource-misc, issue-tracking, patch, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/vendor-advisory, x-refsource-fedora
- https://www.oracle.com/security-alerts/cpujul2022.htmlx-refsource-misc, patch, third-party-advisory
- https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibcx-refsource-misc, exploit, third-party-advisory
- https://security.netapp.com/advisory/ntap-20210909-0005/x-refsource-confirm, third-party-advisory
- https://security.gentoo.org/glsa/202208-24vendor-advisory, x-refsource-gentoo, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-831302.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.