Vulnerability-Lookup

CVE-2021-3655 (GCVE-0-2021-3655)

Vulnerability from cvelistv5 – Published: 2021-08-05 20:48 – Updated: 2026-10-08 21:03

Summary

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-08 20:59 UTC

CWE

CWE-909

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 969 records in the last 180 days details

References

3 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1984024	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version	CPE status
n/a	kernel	Affected: kernel v5.14-rc1

Show details on NVD website

JSON

To clipboard

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}

GSD-2021-3655

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

Aliases

CVE-2021-3655

Aliases

CVE-2021-3655

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-3655",
    "description": "A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.",
    "id": "GSD-2021-3655",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3655.html",
      "https://ubuntu.com/security/CVE-2021-3655",
      "https://advisories.mageia.org/CVE-2021-3655.html",
      "https://security.archlinux.org/CVE-2021-3655",
      "https://alas.aws.amazon.com/cve/html/CVE-2021-3655.html",
      "https://linux.oracle.com/cve/CVE-2021-3655.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3655"
      ],
      "details": "A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.",
      "id": "GSD-2021-3655",
      "modified": "2023-12-13T01:23:34.028931Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-3655",
        "STATE": "PUBLIC"
      },
      "affects": {
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          "vendor_data": [
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          }
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      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
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            }
          ]
        },
        "problemtype": {
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              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1984024"
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            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 2.1,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.3,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-10-27T12:29Z",
      "publishedDate": "2021-08-05T21:15Z"
    }
  }
}

MSRC_CVE-2021-3655

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

Summary

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

Scope

1 vulnerability in this advisory, including CVE-2021-3655.

CVE-2021-3655

3.3 (Low)


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

Fixed: 2 products Known affected: 2 products

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

Open the full advisory

OESA-2021-1310 (CVE-2021-3659)

Vulnerability from osv_openeuler – Published: 2021-08-14 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

A NULL pointer dereference flaw was found in the Linux kernel’s IEEE 802.15.4 wireless networking subsystem in the way the user closes the LR-WPAN connection. This flaw allows a local user to crash the system. The highest threat from this vulnerability is to system availability.(CVE-2021-3659)

arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory corruption via rtas_args.nargs, aka CID-f62f3c20647e.(CVE-2021-37576)

A vulnerability was found in the Linux kernel in versions before v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.(CVE-2021-3655).

No description is available for this CVE.(CVE-2022-0850).

Severity

7.8 (High)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3659	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-37576	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3655	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2022-0850	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "kernel-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "python2-perf-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-devel-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "python3-perf-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-debugsource-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-source-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "python2-perf-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-tools-devel-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "bpftool-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-tools-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "perf-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
          "kernel-tools-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
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          "bpftool-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
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          "kernel-debuginfo-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "python3-perf-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "kernel-tools-devel-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "python3-perf-debuginfo-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "kernel-source-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "python2-perf-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "kernel-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
          "kernel-tools-4.19.90-2108.4.0.0102.oe1.x86_64.rpm",
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          "kernel-debugsource-4.19.90-2108.4.0.0102.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-20.03-LTS-SP1"
      },
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          "type": "ECOSYSTEM"
        }
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      "ecosystem_specific": {
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          "bpftool-debuginfo-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
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          "kernel-devel-4.19.90-2108.4.0.0102.oe1.aarch64.rpm",
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      },
      "package": {
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        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
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          "events": [
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nA NULL pointer dereference flaw was found in the Linux kernel\u2019s IEEE 802.15.4 wireless networking subsystem in the way the user closes the LR-WPAN connection. This flaw allows a local user to crash the system. The highest threat from this vulnerability is to system availability.(CVE-2021-3659)\r\n\r\narch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory corruption via rtas_args.nargs, aka CID-f62f3c20647e.(CVE-2021-37576)\r\n\r\nA vulnerability was found in the Linux kernel in versions before v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.(CVE-2021-3655).\n\nNo description is available for this CVE.(CVE-2022-0850).",
  "id": "OESA-2021-1310",
  "modified": "2026-08-06T11:04:33Z",
  "published": "2021-08-14T11:04:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1310"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3659"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-37576"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3655"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-0850"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2021-3659",
    "CVE-2021-37576",
    "CVE-2021-3655",
    "CVE-2022-0850"
  ]
}

OPENSUSE-SU-2021:1477-1

Vulnerability from csaf_opensuse - Published: 2021-11-15 12:24 - Updated: 2026-09-20 19:30

Summary

Security update for the Linux Kernel

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 19 products

Open the full advisory

OPENSUSE-SU-2021:3641-1

Vulnerability from csaf_opensuse - Published: 2021-11-09 16:28 - Updated: 2026-09-20 19:35

Summary

Security update for the Linux Kernel

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 14 products

Open the full advisory

OPENSUSE-SU-2021:3675-1

Vulnerability from csaf_opensuse - Published: 2021-11-16 16:48 - Updated: 2026-09-20 19:36

Summary

Security update for the Linux Kernel

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 143 products

Open the full advisory

OPENSUSE-SU-2021:3876-1

Vulnerability from csaf_opensuse - Published: 2021-12-02 07:19 - Updated: 2026-09-20 19:36

Summary

Security update for the Linux Kernel

Severity

Important

Scope

43 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 21 products

Open the full advisory

SUSE-SU-2021:14849-1

Vulnerability from csaf_suse - Published: 2021-12-01 16:01 - Updated: 2026-09-20 13:55

Summary

Security update for the Linux Kernel

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 216 products

Open the full advisory

SUSE-SU-2021:3640-1

Vulnerability from csaf_suse - Published: 2021-11-09 16:28 - Updated: 2026-09-20 14:08

Summary

Security update for the Linux Kernel

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 40 products

Open the full advisory

SUSE-SU-2021:3641-1

Vulnerability from csaf_suse - Published: 2021-11-09 16:28 - Updated: 2026-09-20 14:08

Summary

Security update for the Linux Kernel

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2021-3655.

CVE-2021-3655

4 (Medium)


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

Recommended: 40 products

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-3655 (GCVE-0-2021-3655)

OESA-2021-1310 (CVE-2021-3659)

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