Vulnerability-Lookup

CVE-2021-38604 (GCVE-0-2021-38604)

Vulnerability from cvelistv5 – Published: 2021-08-12 15:43 – Updated: 2025-05-30 19:48

Summary

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.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-30 19:18 UTC

CWE

n/a
CWE-476 - NULL Pointer Dereference

Assigner

mitre mitre root

References

8 references

URL	Tags
https://sourceware.org/git/?p=glibc.git%3Ba=commi…	x_refsource_MISC
https://sourceware.org/git/?p=glibc.git%3Ba=commi…	x_refsource_MISC
https://sourceware.org/bugzilla/show_bug.cgi?id=28213	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC
https://blog.tuxcare.com/cve/tuxcare-team-identif…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021090…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-24	vendor-advisoryx_refsource_GENTOO

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      "status": "final",
      "title": "glibc: NULL pointer dereference in helper_thread() in mq_notify.c while handling NOTIFY_REMOVED messages",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-38604.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://sourceware.org/bugzilla/show_bug.cgi?id=28213\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/\", \"name\": \"FEDORA-2021-16dc1f33af\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2022.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibc\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210909-0005/\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/202208-24\", \"name\": \"GLSA-202208-24\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T01:44:23.621Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-38604\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-05-30T19:18:15.996300Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-05-30T19:06:05.021Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"references\": [{\"url\": \"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://sourceware.org/bugzilla/show_bug.cgi?id=28213\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/\", \"name\": \"FEDORA-2021-16dc1f33af\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2022.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibc\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210909-0005/\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://security.gentoo.org/glsa/202208-24\", \"name\": \"GLSA-202208-24\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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. 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NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"n/a\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-38604\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"cve@mitre.org\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-38604\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-30T19:48:04.201Z\", \"dateReserved\": \"2021-08-12T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2021-08-12T15:43:34.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

ICSA-23-166-10

Vulnerability from csaf_cisa - Published: 2023-06-13 00:00 - Updated: 2024-04-09 00:00

Summary

Siemens SIMATIC S7-1500 TM MFP BIOS

Scope

72 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109945851/

Open the full advisory

ICSA-23-348-10

Vulnerability from csaf_cisa - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

Siemens SIMATIC S7-1500

Scope

544 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

MSRC_CVE-2021-38604

Vulnerability from csaf_microsoft - Published: 2021-08-02 00:00 - Updated: 2021-12-16 00:00

Summary

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.

Scope

1 vulnerability in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


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

Fixed: 2 products Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

SSA-398330

Vulnerability from csaf_siemens - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

Scope

544 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

SSA-831302

Vulnerability from csaf_siemens - Published: 2023-06-13 00:00 - Updated: 2024-04-09 00:00

Summary

SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0

Scope

72 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109945851/

Open the full advisory

ubuntu-cve-2021-38604

Vulnerability from osv_ubuntu

Published

2021-08-12 16:15

Modified

2025-07-16 04:57

Summary

Details

Severity

7.5 (High)


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

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-38604	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-38604	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-doc",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "glibc-source",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-bin",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-bin-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-dev-bin-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-devtools",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-devtools-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-amd64",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-amd64-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dbg",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-i386",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-i386-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-prof",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-s390-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-x32-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "nscd-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.34-0ubuntu3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.34-0ubuntu3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2021-38604",
  "modified": "2025-07-16T04:57:28Z",
  "published": "2021-08-12T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38604"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-38604"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-38604"
  ],
  "withdrawn": "2025-07-18T16:46:57Z"
}

WID-SEC-W-2023-1432

Vulnerability from csaf_certbund - Published: 2023-06-12 22:00 - Updated: 2023-06-22 22:00

Summary

Siemens SIMATIC S7: Mehrere Schwachstellen

Severity

Kritisch

Scope

149 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

In Siemens SIMATIC S7 existieren mehrere Schwachstellen. Die Fehler bestehen unter anderem aufgrund von unzulässigen Einschränkungen, Pufferüberläufen, fehlenden Freigaben und use-after-free-Problemen. Ein Angreifer kann diese Schwachstellen ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen, seine Privilegien zu erweitern und Daten zu manipulieren. Die erfolgreiche Ausnutzung einiger dieser Schwachstellen erfordert eine Benutzerinteraktion oder erhöhte Privilegien.

Known affected: 2 products

Open the full advisory

WID-SEC-W-2023-3051

Vulnerability from csaf_certbund - Published: 2021-08-12 22:00 - Updated: 2023-12-04 23:00

Summary

GNU libc: Schwachstelle ermöglicht nicht spezifizierten Angriff

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2021-38604.

CVE-2021-38604

Es existiert eine Schwachstelle in GNU libc in der Funktion "sysdeps/unix/sysv/linux/mq_notify.c". Der Fehler basiert auf einem fehlerhaften Umgang mit bestimmten Daten wodurch eine Null-Zeiger-Dereferenzierung auftritt. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um nicht näher spezifizierte Auswirkungen zu verursachen.

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2021-38604 (GCVE-0-2021-38604)

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature