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CVE-2026-83942 Microsoft CVE debrief

The CVE-2026-83942 vulnerability is a Windows Kernel Elevation of Privilege Vulnerability. An authorized attacker can exploit this vulnerability locally to elevate privileges. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server versions. The vulnerability allows local privilege escalation, requiring verification and patching for affected systems. Exposure assessment is necessary for Windows administrators and users with local access. The CVE Program and NVD provide official records of this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-08
Advisory published
2026-09-08
Advisory updated
2026-10-08

Who should care

Windows administrators and users with local access to affected systems should assess exposure and prioritize patching. This includes reviewing system configurations, applying security updates, and monitoring for potential attacks. Defenders should prioritize patching affected Windows versions and assess exposure for Windows administrators and users with local access.

Why it matters

CVE-2026-83942 is a Windows Kernel Elevation of Privilege Vulnerability that allows local privilege escalation. Defenders should prioritize patching affected Windows versions and assess exposure for Windows administrators and users with local access.

  • Local privilege escalation requires verification
  • Patching is required for affected Windows versions
  • Exposure assessment is necessary for Windows administrators

Technical summary

The Windows Kernel Elevation of Privilege Vulnerability (CVE-2026-83942) allows an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

Defenders should prioritize patching this vulnerability, especially for systems exposed to local attacks. Assess exposure for Windows administrators and users with local access.

Recommended defensive actions

  • Patch affected Windows systems
  • Assess exposure for local Windows users and administrators
  • Verify patch deployment for Windows Server versions

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this vulnerability. The vulnerability affects multiple Windows versions, including Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83942 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83942

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-83942 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83942

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Windows Kernel Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/83xxx/CVE-2026-83942.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83942

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.