Vulnerability-Lookup

CNVD-2022-69199

Vulnerability from cnvd - Published: 2022-10-17

Title

Linux Kernel kvm_dirty_ring_get()函数拒绝服务漏洞

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 kvm_dirty_ring_get()存在函数拒绝服务漏洞，该漏洞是由于在未创建vCPU的情况下，virt/kvm/dirty_ring.c中的kvm_dirty_ring（）函数存在NULL指针取消引用漏洞造成的。本地经过身份验证的攻击者可以利用此漏洞造成拒绝服务条件。

Severity

低

Patch Name

Linux Kernel kvm_dirty_ring_get()函数拒绝服务漏洞的补丁

Patch Description

Formal description

目前厂商已发布升级补丁以修复漏洞，详情请关注厂商主页： https://vigilance.fr/vulnerability/Linux-kernel-NULL-pointer-dereference-via-kvm-dirty-ring-get-37072

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-4095

Impacted products

Name
Linux Linux kernel <5.17-rc1

Show details on source website

JSON

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    "cve": {
      "cveNumber": "CVE-2021-4095",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-4095"
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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 kvm_dirty_ring_get()\u5b58\u5728\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8e\u5728\u672a\u521b\u5efavCPU\u7684\u60c5\u51b5\u4e0b\uff0cvirt/kvm/dirty_ring.c\u4e2d\u7684kvm_dirty_ring\uff08\uff09\u51fd\u6570\u5b58\u5728NULL\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\u9020\u6210\u7684\u3002\u672c\u5730\u7ecf\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u7684\u653b\u51fb\u8005\u53ef\u4ee5\u5229\u7528\u6b64\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\u6761\u4ef6\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8be6\u60c5\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\uff1a\r\nhttps://vigilance.fr/vulnerability/Linux-kernel-NULL-pointer-dereference-via-kvm-dirty-ring-get-37072",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2022-69199",
  "openTime": "2022-10-17",
  "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 kvm_dirty_ring_get()\u5b58\u5728\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8e\u5728\u672a\u521b\u5efavCPU\u7684\u60c5\u51b5\u4e0b\uff0cvirt/kvm/dirty_ring.c\u4e2d\u7684kvm_dirty_ring\uff08\uff09\u51fd\u6570\u5b58\u5728NULL\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\u9020\u6210\u7684\u3002\u672c\u5730\u7ecf\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u7684\u653b\u51fb\u8005\u53ef\u4ee5\u5229\u7528\u6b64\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\u6761\u4ef6\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",
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  "products": {
    "product": "Linux Linux kernel \u003c5.17-rc1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-4095",
  "serverity": "\u4f4e",
  "submitTime": "2021-12-24",
  "title": "Linux Kernel kvm_dirty_ring_get()\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e"
}

CVE-2021-4095 (GCVE-0-2021-4095)

Vulnerability from cvelistv5 – Published: 2022-03-08 14:05 – Updated: 2024-08-03 17:16

Summary

A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.

Severity

No CVSS data available.

CWE

CWE-476

Assigner

redhat redhat root

References

4 references

URL	Tags
http://www.openwall.com/lists/oss-security/2022/01/17/1	mailing-listx_refsource_MLIST
https://bugzilla.redhat.com/show_bug.cgi?id=2031194	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
n/a	kernel	Affected: Linux kernel versions prior to 5.17-rc1

Show details on NVD website

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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.