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CVE-2026-40369

Full vulnerability record from the local CVENow database.

Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-12 18:17:16.023000
Last modified
2026-11-03 23:17:43.373000
View original CVE JSON
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  "id": "CVE-2026-40369",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-12T18:17:16.023",
  "lastModified": "2026-11-03T23:17:43.373",
  "vulnStatus": "Modified",
  "cveTags": [],
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      "lang": "en",
      "value": "Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
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          "vendor": "Microsoft",
          "product": "Windows 11 Version 24H2",
          "platforms": [
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        },
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  "metrics": {
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
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          "role": "CISA Coordinator",
          "version": "2.0.3"
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  "weaknesses": [
    {
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      "type": "Secondary",
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  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40369",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}