MSRC_CVE-2026-35420

Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-12 07:00
Summary
Windows Kernel Elevation of Privilege Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-122 - Heap-based Buffer Overflow
Affected products
Product Identifier Version Remediation
Windows Server 2012 6.2.9200.26079
Windows Server 2012
6.2.9200.26079
Windows Server 2012 (Server Core installation) 6.2.9200.26079
Windows Server 2012 (Server Core installation)
6.2.9200.26079
Windows Server 2012 R2 6.3.9600.23181
Windows Server 2012 R2
6.3.9600.23181
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23181
Windows Server 2012 R2 (Server Core installation)
6.3.9600.23181
Windows Server 2016 10.0.14393.9140
Windows Server 2016
10.0.14393.9140
Windows Server 2016 (Server Core installation) 10.0.14393.9140
Windows Server 2016 (Server Core installation)
10.0.14393.9140
Windows Server 2019 10.0.17763.8755
Windows Server 2019
10.0.17763.8755
Windows Server 2019 (Server Core installation) 10.0.17763.8755
Windows Server 2019 (Server Core installation)
10.0.17763.8755
Windows Server 2022 10.0.20348.5139
Windows Server 2022
10.0.20348.5139
Windows Server 2022 (Server Core installation) 10.0.20348.5139
Windows Server 2022 (Server Core installation)
10.0.20348.5139
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2330
Windows Server 2025 10.0.26100.32860
Windows Server 2025
10.0.26100.32860
Windows Server 2025 (Server Core installation) 10.0.26100.32860
Windows Server 2025 (Server Core installation)
10.0.26100.32860
Product Identifier Version Remediation
Windows Server 2025 (Server Core installation) <10.0.26100.32860
Windows Server 2025 (Server Core installation)
<10.0.26100.32860
Vendor Fix fix
Vendor Fix fix
Windows Server 2025 <10.0.26100.32860
Windows Server 2025
<10.0.26100.32860
Vendor Fix fix
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2330
Windows Server 2022, 23H2 Edition (Server Core installation)
<10.0.25398.2330
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.5139
Windows Server 2022 (Server Core installation)
<10.0.20348.5139
Vendor Fix fix
Vendor Fix fix
Windows Server 2022 <10.0.20348.5139
Windows Server 2022
<10.0.20348.5139
Vendor Fix fix
Vendor Fix fix
Windows Server 2019 (Server Core installation) <10.0.17763.8755
Windows Server 2019 (Server Core installation)
<10.0.17763.8755
Vendor Fix fix
Windows Server 2019 <10.0.17763.8755
Windows Server 2019
<10.0.17763.8755
Vendor Fix fix
Windows Server 2016 (Server Core installation) <10.0.14393.9140
Windows Server 2016 (Server Core installation)
<10.0.14393.9140
Vendor Fix fix
Windows Server 2016 <10.0.14393.9140
Windows Server 2016
<10.0.14393.9140
Vendor Fix fix
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23181
Windows Server 2012 R2 (Server Core installation)
<6.3.9600.23181
Vendor Fix fix
Windows Server 2012 R2 <6.3.9600.23181
Windows Server 2012 R2
<6.3.9600.23181
Vendor Fix fix
Windows Server 2012 (Server Core installation) <6.2.9200.26079
Windows Server 2012 (Server Core installation)
<6.2.9200.26079
Vendor Fix fix
Windows Server 2012 <6.2.9200.26079
Windows Server 2012
<6.2.9200.26079
Vendor Fix fix
Threats
Impact Elevation of Privilege
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Acknowledgments
<a href="https://linkedin.com/in/jongseongkim">Jongseong Kim (nevul37), SEC-agent team</a>
<a href="https://linkedin.com/in/hwiwonlee">Hwiwon Lee (hwiwonl), SEC-agent team</a>
Younggi Park (grill66), SEC-agent team

{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "\u003ca href=\"https://linkedin.com/in/jongseongkim\"\u003eJongseong Kim (nevul37), SEC-agent team\u003c/a\u003e"
        ]
      },
      {
        "names": [
          "\u003ca href=\"https://linkedin.com/in/hwiwonlee\"\u003eHwiwon Lee (hwiwonl), SEC-agent team\u003c/a\u003e"
        ]
      },
      {
        "names": [
          "Younggi Park (grill66), SEC-agent team"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-35420 Windows Kernel Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35420"
      },
      {
        "category": "self",
        "summary": "CVE-2026-35420 Windows Kernel Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-35420.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Windows Kernel Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-12T07:00:00.000Z",
      "generator": {
        "date": "2026-05-12T17:53:08.751Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-35420",
      "initial_release_date": "2026-05-12T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-12T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.17763.8755",
            "product": {
              "name": "Windows Server 2019 \u003c10.0.17763.8755",
              "product_id": "7"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.17763.8755",
            "product": {
              "name": "Windows Server 2019 10.0.17763.8755",
              "product_id": "11571"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2019"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.17763.8755",
            "product": {
              "name": "Windows Server 2019 (Server Core installation) \u003c10.0.17763.8755",
              "product_id": "6"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.17763.8755",
            "product": {
              "name": "Windows Server 2019 (Server Core installation) 10.0.17763.8755",
              "product_id": "11572"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2019 (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.20348.5139",
            "product": {
              "name": "Windows Server 2022 \u003c10.0.20348.5139",
              "product_id": "5"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.20348.5139",
            "product": {
              "name": "Windows Server 2022 10.0.20348.5139",
              "product_id": "11923"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2022"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.20348.5139",
            "product": {
              "name": "Windows Server 2022 (Server Core installation) \u003c10.0.20348.5139",
              "product_id": "4"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.20348.5139",
            "product": {
              "name": "Windows Server 2022 (Server Core installation) 10.0.20348.5139",
              "product_id": "11924"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2022 (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.26100.32860",
            "product": {
              "name": "Windows Server 2025 (Server Core installation) \u003c10.0.26100.32860",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.26100.32860",
            "product": {
              "name": "Windows Server 2025 (Server Core installation) 10.0.26100.32860",
              "product_id": "12437"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2025 (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.25398.2330",
            "product": {
              "name": "Windows Server 2022, 23H2 Edition (Server Core installation) \u003c10.0.25398.2330",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.25398.2330",
            "product": {
              "name": "Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330",
              "product_id": "12244"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2022, 23H2 Edition (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.26100.32860",
            "product": {
              "name": "Windows Server 2025 \u003c10.0.26100.32860",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.26100.32860",
            "product": {
              "name": "Windows Server 2025 10.0.26100.32860",
              "product_id": "12436"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2025"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.14393.9140",
            "product": {
              "name": "Windows Server 2016 \u003c10.0.14393.9140",
              "product_id": "9"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.14393.9140",
            "product": {
              "name": "Windows Server 2016 10.0.14393.9140",
              "product_id": "10816"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2016"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c10.0.14393.9140",
            "product": {
              "name": "Windows Server 2016 (Server Core installation) \u003c10.0.14393.9140",
              "product_id": "8"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.14393.9140",
            "product": {
              "name": "Windows Server 2016 (Server Core installation) 10.0.14393.9140",
              "product_id": "10855"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2016 (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c6.2.9200.26079",
            "product": {
              "name": "Windows Server 2012 \u003c6.2.9200.26079",
              "product_id": "13"
            }
          },
          {
            "category": "product_version",
            "name": "6.2.9200.26079",
            "product": {
              "name": "Windows Server 2012 6.2.9200.26079",
              "product_id": "10378"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2012"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c6.2.9200.26079",
            "product": {
              "name": "Windows Server 2012 (Server Core installation) \u003c6.2.9200.26079",
              "product_id": "12"
            }
          },
          {
            "category": "product_version",
            "name": "6.2.9200.26079",
            "product": {
              "name": "Windows Server 2012 (Server Core installation) 6.2.9200.26079",
              "product_id": "10379"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2012 (Server Core installation)"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c6.3.9600.23181",
            "product": {
              "name": "Windows Server 2012 R2 \u003c6.3.9600.23181",
              "product_id": "11"
            }
          },
          {
            "category": "product_version",
            "name": "6.3.9600.23181",
            "product": {
              "name": "Windows Server 2012 R2 6.3.9600.23181",
              "product_id": "10483"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2012 R2"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c6.3.9600.23181",
            "product": {
              "name": "Windows Server 2012 R2 (Server Core installation) \u003c6.3.9600.23181",
              "product_id": "10"
            }
          },
          {
            "category": "product_version",
            "name": "6.3.9600.23181",
            "product": {
              "name": "Windows Server 2012 R2 (Server Core installation) 6.3.9600.23181",
              "product_id": "10543"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2012 R2 (Server Core installation)"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-35420",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.",
          "title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "10378",
          "10379",
          "10483",
          "10543",
          "10816",
          "10855",
          "11571",
          "11572",
          "11923",
          "11924",
          "12244",
          "12436",
          "12437"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
          "11",
          "12",
          "13"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-35420 Windows Kernel Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35420"
        },
        {
          "category": "self",
          "summary": "CVE-2026-35420 Windows Kernel Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-35420.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.17763.8755:Security Update:https://support.microsoft.com/help/5087538",
          "product_ids": [
            "7",
            "6"
          ],
          "url": "https://support.microsoft.com/help/5087538"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.20348.5139:Security Update:https://support.microsoft.com/help/5087545",
          "product_ids": [
            "5",
            "4"
          ],
          "url": "https://support.microsoft.com/help/5087545"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.20348.5074:Security Hotpatch Update:https://support.microsoft.com/help/5087424",
          "product_ids": [
            "5",
            "4"
          ],
          "url": "https://support.microsoft.com/help/5087424"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.26100.32860:Security Update:https://support.microsoft.com/help/5087539",
          "product_ids": [
            "1",
            "2"
          ],
          "url": "https://support.microsoft.com/help/5087539"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.26100.32772:Security Hotpatch Update:https://support.microsoft.com/help/5087423",
          "product_ids": [
            "1",
            "2"
          ],
          "url": "https://support.microsoft.com/help/5087423"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.25398.2330:Security Update:https://support.microsoft.com/help/5087541",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5087541"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "10.0.14393.9140:Security Update:https://support.microsoft.com/help/5087537",
          "product_ids": [
            "9",
            "8"
          ],
          "url": "https://support.microsoft.com/help/5087537"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "6.2.9200.26079:Monthly Rollup:https://support.microsoft.com/help/5087470",
          "product_ids": [
            "13",
            "12"
          ],
          "url": "https://support.microsoft.com/help/5087470"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "6.3.9600.23181:Monthly Rollup:https://support.microsoft.com/help/5087471",
          "product_ids": [
            "11",
            "10"
          ],
          "url": "https://support.microsoft.com/help/5087471"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Windows Kernel Elevation of Privilege Vulnerability"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…