← Back to CVE Explorer

CVE-2026-85858

Full vulnerability record from the local CVENow database.

Description

Out-of-bounds read in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-10-13 19:21:12.410000
Last modified
2026-10-29 19:36:29.760000
View original CVE JSON
{
  "id": "CVE-2026-85858",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-13T19:21:12.410",
  "lastModified": "2026-10-29T19:36:29.760",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Out-of-bounds read in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows 11 version 23H2",
          "platforms": [
            "ARM64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.22631.0",
              "lessThan": "10.0.22631.7652",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 23H2",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.22631.0",
              "lessThan": "10.0.22631.7652",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 24H2",
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.26100.0",
              "lessThan": "10.0.26100.9711",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 25H2",
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.26200.0",
              "lessThan": "10.0.26200.9711",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 version 26H1",
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.28000.0",
              "lessThan": "10.0.28000.3231",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows 11 Version 26H2",
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.26300.0",
              "lessThan": "10.0.26300.9711",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2022",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.20348.0",
              "lessThan": "10.0.20348.5761",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2025",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.26100.0",
              "lessThan": "10.0.26100.33650",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2025 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.26100.0",
              "lessThan": "10.0.26100.33650",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.1,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-13T20:06:41.893426Z",
          "id": "CVE-2026-85858",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*",
              "versionEndExcluding": "10.0.22631.7652",
              "matchCriteriaId": "C31937C6-EFB5-4325-9F94-0F356B164035"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.22631.7652",
              "matchCriteriaId": "AAC3F2E7-6713-4BE0-9DAA-59310B4C3863"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
              "versionEndExcluding": "10.0.26100.9711",
              "matchCriteriaId": "E2A85326-7BE4-4F2C-AF37-45FD4B939D07"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.26100.9711",
              "matchCriteriaId": "03291588-C7D5-445C-AD9F-03D3ADE6BE8A"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
              "versionEndExcluding": "10.0.26200.9711",
              "matchCriteriaId": "5E5700DF-EF80-4D08-9B32-E0481EAE8147"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.26200.9711",
              "matchCriteriaId": "BA7D90B4-6AD5-4EF9-8709-01E4CED31779"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*",
              "versionEndExcluding": "10.0.28000.3231",
              "matchCriteriaId": "EC0260C7-D6B6-487F-B304-CAAE72608BF7"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.28000.3231",
              "matchCriteriaId": "8DA3AD5D-32C0-4AC9-A856-512106D42CC7"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*",
              "versionEndExcluding": "10.0.26300.9711",
              "matchCriteriaId": "8D5DCA1A-EF56-43AF-B079-011AE5C2F846"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.26300.9711",
              "matchCriteriaId": "38D4479B-ACB0-4DC7-A4B1-F448C5B2EBD8"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.20348.5761",
              "matchCriteriaId": "A98E694F-9390-488A-A7FB-3E7BF7E988F8"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*",
              "versionEndExcluding": "10.0.26100.33650",
              "matchCriteriaId": "D95E80FE-F34C-4805-9A66-75D090E65BBB"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85858",
      "source": "[email protected]",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}