Vulnerability-Lookup

OESA-2021-1336 (CVE-2021-3640)

Vulnerability from osv_openeuler – Published: 2021-09-06 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

kernel security update

Details

he Linux Kernel, the operating system core itself.

Security Fix(es):

A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.(CVE-2021-3640)

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://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3640	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "kernel-debuginfo-4.19.90-2109.1.0.0108.oe1.aarch64.rpm",
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        ],
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          "kernel-tools-4.19.90-2109.1.0.0108.oe1.x86_64.rpm",
          "perf-debuginfo-4.19.90-2109.1.0.0108.oe1.x86_64.rpm",
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          "type": "ECOSYSTEM"
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    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "he Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nA flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.(CVE-2021-3640)",
  "id": "OESA-2021-1336",
  "modified": "2026-08-06T11:04:36Z",
  "published": "2021-09-06T11:04:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1336"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3640"
    }
  ],
  "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-2021-3640"
  ]
}

CVE-2021-3640 (GCVE-0-2021-3640)

Vulnerability from cvelistv5 – Published: 2022-03-03 22:04 – Updated: 2024-08-03 17:01

Summary

Severity

No CVSS data available.

CWE

CWE-362 - - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), CWE-416 - Use After Free.

Assigner

redhat redhat root

References

9 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1980646	x_refsource_MISC
https://ubuntu.com/security/CVE-2021-3640	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://github.com/torvalds/linux/commit/99c23da0…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2022/dsa-5096	vendor-advisoryx_refsource_DEBIAN
https://security.netapp.com/advisory/ntap-2022041…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	kernel	Affected: Affects kernel v5.15.3 and prior, Fixed in v5.16-rc1 and above.

Show details on NVD website

JSON

To clipboard

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    "state": "PUBLISHED"
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}

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.
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.