MSRC_CVE-2026-21222

Vulnerability from csaf_microsoft - Published: 2026-02-10 08:00 - Updated: 2026-02-10 08:00
Summary
Windows Kernel Information Disclosure 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-532 - Insertion of Sensitive Information into Log File
Affected products
Product Identifier Version Remediation
Windows Server 2012 R2 6.3.9600.23022
Windows Server 2012 R2
6.3.9600.23022
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23022
Windows Server 2012 R2 (Server Core installation)
6.3.9600.23022
Windows Server 2016 10.0.14393.8868
Windows Server 2016
10.0.14393.8868
Windows 10 Version 1607 for 32-bit Systems 10.0.14393.8868
Windows 10 Version 1607 for 32-bit Systems
10.0.14393.8868
Windows 10 Version 1607 for x64-based Systems 10.0.14393.8868
Windows 10 Version 1607 for x64-based Systems
10.0.14393.8868
Windows Server 2016 (Server Core installation) 10.0.14393.8868
Windows Server 2016 (Server Core installation)
10.0.14393.8868
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8389
Windows 10 Version 1809 for 32-bit Systems
10.0.17763.8389
Windows 10 Version 1809 for x64-based Systems 10.0.17763.8389
Windows 10 Version 1809 for x64-based Systems
10.0.17763.8389
Windows Server 2019 10.0.17763.8389
Windows Server 2019
10.0.17763.8389
Windows Server 2019 (Server Core installation) 10.0.17763.8389
Windows Server 2019 (Server Core installation)
10.0.17763.8389
Windows Server 2022 10.0.20348.4773
Windows Server 2022
10.0.20348.4773
Windows Server 2022 (Server Core installation) 10.0.20348.4773
Windows Server 2022 (Server Core installation)
10.0.20348.4773
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.6937
Windows 10 Version 21H2 for 32-bit Systems
10.0.19044.6937
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.6937
Windows 10 Version 21H2 for ARM64-based Systems
10.0.19044.6937
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.6937
Windows 10 Version 21H2 for x64-based Systems
10.0.19044.6937
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.6937
Windows 10 Version 22H2 for x64-based Systems
10.0.19045.6937
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.6937
Windows 10 Version 22H2 for ARM64-based Systems
10.0.19045.6937
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.6937
Windows 10 Version 22H2 for 32-bit Systems
10.0.19045.6937
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6649
Windows 11 Version 23H2 for ARM64-based Systems
10.0.22631.6649
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6649
Windows 11 Version 23H2 for x64-based Systems
10.0.22631.6649
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2149
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2149
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.7840
Windows 11 Version 24H2 for ARM64-based Systems
10.0.26100.7840
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.7840
Windows 11 Version 24H2 for x64-based Systems
10.0.26100.7840
Windows Server 2025 10.0.26100.32370
Windows Server 2025
10.0.26100.32370
Windows Server 2025 (Server Core installation) 10.0.26100.32370
Windows Server 2025 (Server Core installation)
10.0.26100.32370
Product Identifier Version Remediation
Windows Server 2025 (Server Core installation) <10.0.26100.32370
Windows Server 2025 (Server Core installation)
<10.0.26100.32370
Vendor Fix fix
Vendor Fix fix
Windows Server 2025 <10.0.26100.32370
Windows Server 2025
<10.0.26100.32370
Vendor Fix fix
Vendor Fix fix
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.7840
Windows 11 Version 24H2 for x64-based Systems
<10.0.26100.7840
Vendor Fix fix
Vendor Fix fix
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.7840
Windows 11 Version 24H2 for ARM64-based Systems
<10.0.26100.7840
Vendor Fix fix
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2149
Windows Server 2022, 23H2 Edition (Server Core installation)
<10.0.25398.2149
Vendor Fix fix
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.6649
Windows 11 Version 23H2 for x64-based Systems
<10.0.22631.6649
Vendor Fix fix
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.6649
Windows 11 Version 23H2 for ARM64-based Systems
<10.0.22631.6649
Vendor Fix fix
Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.6937
Windows 10 Version 22H2 for 32-bit Systems
<10.0.19045.6937
Vendor Fix fix
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.6937
Windows 10 Version 22H2 for ARM64-based Systems
<10.0.19045.6937
Vendor Fix fix
Windows 10 Version 22H2 for x64-based Systems <10.0.19045.6937
Windows 10 Version 22H2 for x64-based Systems
<10.0.19045.6937
Vendor Fix fix
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.6937
Windows 10 Version 21H2 for x64-based Systems
<10.0.19044.6937
Vendor Fix fix
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.6937
Windows 10 Version 21H2 for ARM64-based Systems
<10.0.19044.6937
Vendor Fix fix
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.6937
Windows 10 Version 21H2 for 32-bit Systems
<10.0.19044.6937
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.4773
Windows Server 2022 (Server Core installation)
<10.0.20348.4773
Vendor Fix fix
Vendor Fix fix
Windows Server 2022 <10.0.20348.4773
Windows Server 2022
<10.0.20348.4773
Vendor Fix fix
Vendor Fix fix
Windows Server 2019 (Server Core installation) <10.0.17763.8389
Windows Server 2019 (Server Core installation)
<10.0.17763.8389
Vendor Fix fix
Windows Server 2019 <10.0.17763.8389
Windows Server 2019
<10.0.17763.8389
Vendor Fix fix
Windows 10 Version 1809 for x64-based Systems <10.0.17763.8389
Windows 10 Version 1809 for x64-based Systems
<10.0.17763.8389
Vendor Fix fix
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.8389
Windows 10 Version 1809 for 32-bit Systems
<10.0.17763.8389
Vendor Fix fix
Windows Server 2016 (Server Core installation) <10.0.14393.8868
Windows Server 2016 (Server Core installation)
<10.0.14393.8868
Vendor Fix fix
Windows 10 Version 1607 for x64-based Systems <10.0.14393.8868
Windows 10 Version 1607 for x64-based Systems
<10.0.14393.8868
Vendor Fix fix
Windows 10 Version 1607 for 32-bit Systems <10.0.14393.8868
Windows 10 Version 1607 for 32-bit Systems
<10.0.14393.8868
Vendor Fix fix
Windows Server 2016 <10.0.14393.8868
Windows Server 2016
<10.0.14393.8868
Vendor Fix fix
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23022
Windows Server 2012 R2 (Server Core installation)
<6.3.9600.23022
Vendor Fix fix
Windows Server 2012 R2 <6.3.9600.23022
Windows Server 2012 R2
<6.3.9600.23022
Vendor Fix fix
Threats
Impact Information Disclosure
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Acknowledgments
Microsoft Offensive Research & Security Engineering

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        "name": "Insertion of Sensitive Information into Log File"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "The type of information that could be disclosed if an attacker successfully exploited this vulnerability is\tKernel memory read - unintentional read access to memory contents in kernel space from a user mode process.",
          "title": "What type of information could be disclosed by this vulnerability?"
        }
      ],
      "product_status": {
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          "10816",
          "10852",
          "10853",
          "10855",
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          "11569",
          "11571",
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          "12097",
          "12098",
          "12099",
          "12242",
          "12243",
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          "12390",
          "12436",
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          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
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          "17",
          "18",
          "19",
          "20",
          "21",
          "22",
          "23",
          "24",
          "25"
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      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-21222 Windows Kernel Information Disclosure Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21222"
        },
        {
          "category": "self",
          "summary": "CVE-2026-21222 Windows Kernel Information Disclosure Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-21222.json"
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      ],
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-02-10T08:00:00.000Z",
          "details": "10.0.17763.8389:Security Update:https://support.microsoft.com/help/5075904",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
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            "4",
            "5",
            "6",
            "7",
            "8",
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            "15",
            "16",
            "17",
            "18",
            "19",
            "20",
            "21",
            "22",
            "23",
            "24",
            "25"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Information Disclosure"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Windows Kernel Information Disclosure Vulnerability"
    }
  ]
}


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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.


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Detection rules are retrieved from Rulezet.

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