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CVE-2021-33909 (GCVE-0-2021-33909)

Vulnerability from cvelistv5 – Published: 2021-07-20 18:01 – Updated: 2024-08-04 00:05
VLAI
Summary
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
CWE
  • n/a
References
URL Tags
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4941 vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/07/22/7 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/0… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/09/17/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/09/17/4 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/09/21/1 mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.openwall.com/lists/oss-security/2021/… x_refsource_MISC
https://github.com/torvalds/linux/commit/8cae8cd8… x_refsource_CONFIRM
https://cdn.kernel.org/pub/linux/kernel/v5.x/Chan… x_refsource_CONFIRM
http://packetstormsecurity.com/files/163621/Sequo… x_refsource_MISC
http://packetstormsecurity.com/files/163671/Kerne… x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021081… x_refsource_CONFIRM
http://packetstormsecurity.com/files/164155/Kerne… x_refsource_MISC
http://packetstormsecurity.com/files/165477/Kerne… x_refsource_MISC
https://psirt.global.sonicwall.com/vuln-detail/SN… x_refsource_CONFIRM
Show details on NVD website

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        "cveTags": [],
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          {
            "lang": "en",
            "value": "fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05."
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            "value": "Un archivo fs/seq_file.c en el kernel de Linux versiones 3.16 hasta 5.13.x anteriores a 5.13.4, no restringe apropiadamente las asignaciones de b\u00faferes seq, conllevando a un desbordamiento de enteros, una escritura fuera de l\u00edmites y una escalada a root por parte de un usuario no privilegiado, tambi\u00e9n se conoce como CID-8cae8cd89f05"
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        "lastModified": "2024-11-21T06:09:45.353",
        "metrics": {
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              "acInsufInfo": false,
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                "authentication": "NONE",
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                "baseScore": 7.2,
                "confidentialityImpact": "COMPLETE",
                "integrityImpact": "COMPLETE",
                "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
                "version": "2.0"
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              "exploitabilityScore": 3.9,
              "impactScore": 10.0,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
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                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2021-07-20T19:15:09.747",
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    "redhat_vex": {
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      "cve": "CVE-2021-33909",
      "id": "CVE-2021-33909",
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      "current_release_date": "2026-08-31T02:03:17Z",
      "cve": "CVE-2021-33909",
      "id": "CVE-2021-33909",
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      "product_status:known_affected": "469",
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      "product_status:recommended": "1762",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-33909",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-33909.json",
      "version": "44"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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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.


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