Vulnerability-Lookup

CNVD-2026-20798

Vulnerability from cnvd - Published: 2026-05-20

Title

Microsoft Windows Hyper-V权限提升漏洞（CNVD-2026-20798）

Description

Microsoft Windows Hyper-V是美国微软（Microsoft）公司的一款可提供硬件虚拟化的工具。该软件允许创建虚拟硬盘驱动器、虚拟交换机以及许多其他虚拟设备。 Microsoft Windows Hyper-V存在权限提升漏洞，攻击者可利用该漏洞在系统上获得更高的权限。

Severity

高

Patch Name

Microsoft Windows Hyper-V权限提升漏洞（CNVD-2026-20798）的补丁

Patch Description

Microsoft Windows Hyper-V是美国微软（Microsoft）公司的一款可提供硬件虚拟化的工具。该软件允许创建虚拟硬盘驱动器、虚拟交换机以及许多其他虚拟设备。 Microsoft Windows Hyper-V存在权限提升漏洞，攻击者可利用该漏洞在系统上获得更高的权限。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

Reference

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

Impacted products

Name
['Microsoft Windows Server 2022', 'Microsoft Windows Server 2022 (Server Core installation)', 'Microsoft Windows 11 23H2']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-40402",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-40402"
    }
  },
  "description": "Microsoft Windows Hyper-V\u662f\u7f8e\u56fd\u5fae\u8f6f\uff08Microsoft\uff09\u516c\u53f8\u7684\u4e00\u6b3e\u53ef\u63d0\u4f9b\u786c\u4ef6\u865a\u62df\u5316\u7684\u5de5\u5177\u3002\u8be5\u8f6f\u4ef6\u5141\u8bb8\u521b\u5efa\u865a\u62df\u786c\u76d8\u9a71\u52a8\u5668\u3001\u865a\u62df\u4ea4\u6362\u673a\u4ee5\u53ca\u8bb8\u591a\u5176\u4ed6\u865a\u62df\u8bbe\u5907\u3002\n\nMicrosoft Windows Hyper-V\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u7cfb\u7edf\u4e0a\u83b7\u5f97\u66f4\u9ad8\u7684\u6743\u9650\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-20798",
  "openTime": "2026-05-20",
  "patchDescription": "Microsoft Windows Hyper-V\u662f\u7f8e\u56fd\u5fae\u8f6f\uff08Microsoft\uff09\u516c\u53f8\u7684\u4e00\u6b3e\u53ef\u63d0\u4f9b\u786c\u4ef6\u865a\u62df\u5316\u7684\u5de5\u5177\u3002\u8be5\u8f6f\u4ef6\u5141\u8bb8\u521b\u5efa\u865a\u62df\u786c\u76d8\u9a71\u52a8\u5668\u3001\u865a\u62df\u4ea4\u6362\u673a\u4ee5\u53ca\u8bb8\u591a\u5176\u4ed6\u865a\u62df\u8bbe\u5907\u3002\r\n\r\nMicrosoft Windows Hyper-V\u5b58\u5728\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u7cfb\u7edf\u4e0a\u83b7\u5f97\u66f4\u9ad8\u7684\u6743\u9650\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": "Microsoft Windows Hyper-V\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2026-20798\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Microsoft Windows Server 2022",
      "Microsoft Windows Server 2022 (Server Core installation)",
      "Microsoft Windows 11 23H2"
    ]
  },
  "referenceLink": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-18",
  "title": "Microsoft Windows Hyper-V\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2026-20798\uff09"
}

CVE-2026-40402 (GCVE-0-2026-40402)

Vulnerability from cvelistv5 – Published: 2026-05-12 16:59 – Updated: 2026-08-10 15:13

Title

Windows Hyper-V Elevation of Privilege Vulnerability

Summary

Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

Severity

9.3 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 03:56 UTC

CWE

CWE-416 - Use After Free

Assigner

microsoft mitre root

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

3 products

Vendor	Product	Version
Microsoft	Windows 11 version 23H2	Affected: 10.0.22631.0 , < 10.0.22631.7079 (custom)
Microsoft	Windows 11 Version 23H2	Affected: 10.0.22631.0 , < 10.0.22631.7219 (custom)
Microsoft	Windows Server 2022	Affected: 10.0.20348.0 , < 10.0.20348.5139 (custom)

Date Public

2026-05-12 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40402",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T03:56:48.427721Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2026-05-13T10:02:55.484Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "platforms": [
            "ARM64-based Systems"
          ],
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          "vendor": "Microsoft",
          "versions": [
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          ]
        },
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              "status": "affected",
              "version": "10.0.20348.0",
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            }
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      "descriptions": [
        {
          "lang": "en-US",
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      "metrics": [
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            "baseSeverity": "CRITICAL",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.