Vulnerability-Lookup

CNVD-2021-13673

Vulnerability from cnvd - Published: 2021-03-01

Title

Linux kernel释放后重用漏洞（CNVD-2021-13673）

Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 5.2.6之前版本存在释放后重用漏洞，该漏洞源于在NUMA系统上，Linux fair调度器在show NUMA stats()中有一个use-after-free，因为NUMA故障统计信息被不适当地释放。目前没有详细的漏洞细节提供。

Severity

中

Patch Name

Linux kernel释放后重用漏洞（CNVD-2021-13673）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新：https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33

Reference

https://nvd.nist.gov/vuln/detail/CVE-2019-20934

Impacted products

Name
Linux Linux kernel <5.2.6

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-20934",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2019-20934"
    }
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  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\n\nLinux kernel 5.2.6\u4e4b\u524d\u7248\u672c\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728NUMA\u7cfb\u7edf\u4e0a\uff0cLinux fair\u8c03\u5ea6\u5668\u5728show NUMA stats()\u4e2d\u6709\u4e00\u4e2ause-after-free\uff0c\u56e0\u4e3aNUMA\u6545\u969c\u7edf\u8ba1\u4fe1\u606f\u88ab\u4e0d\u9002\u5f53\u5730\u91ca\u653e\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1ahttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-13673",
  "openTime": "2021-03-01",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel 5.2.6\u4e4b\u524d\u7248\u672c\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728NUMA\u7cfb\u7edf\u4e0a\uff0cLinux fair\u8c03\u5ea6\u5668\u5728show NUMA stats()\u4e2d\u6709\u4e00\u4e2ause-after-free\uff0c\u56e0\u4e3aNUMA\u6545\u969c\u7edf\u8ba1\u4fe1\u606f\u88ab\u4e0d\u9002\u5f53\u5730\u91ca\u653e\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Linux kernel\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff08CNVD-2021-13673\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Linux kernel \u003c5.2.6"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2019-20934",
  "serverity": "\u4e2d",
  "submitTime": "2020-11-30",
  "title": "Linux kernel\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff08CNVD-2021-13673\uff09"
}

CVE-2019-20934 (GCVE-0-2019-20934)

Vulnerability from cvelistv5 – Published: 2020-11-28 06:20 – Updated: 2024-08-05 03:00

Summary

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

3 references

URL	Tags
https://cdn.kernel.org/pub/linux/kernel/v5.x/Chan…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://bugs.chromium.org/p/project-zero/issues/d…	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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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.