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CVE-2026-83882 Microsoft CVE debrief

A heap-based buffer overflow in the Windows Kernel allows an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability. The vulnerability is a high-severity issue, and defenders managing Windows deployments should assess exposure, apply patches, and monitor for potential exploitation attempts. The affected versions include 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 11 Version 26H2,

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows systems, particularly those managing Windows 10, Windows 11, and Windows Server deployments, should assess exposure and apply patches immediately.

Why it matters

CVE-2026-83882 is a high-severity vulnerability in the Windows Kernel that allows an authorized attacker to elevate privileges locally. Defenders managing Windows deployments should assess exposure, apply patches, and monitor for potential exploitation attempts.

  • Elevation of privilege for authorized attackers
  • Potential for local exploitation
  • Need for patching affected Windows versions
  • Importance of monitoring for exploitation attempts

Technical summary

The Windows Kernel is vulnerable to a heap-based buffer overflow, allowing an authorized attacker to elevate privileges locally. This 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 11 Version 26H2, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

Apply patches immediately for Windows versions listed as affected, assess exposure based on inventory of Windows deployments, and monitor for potential exploitation attempts.

Recommended defensive actions

  • Apply patches for affected Windows versions
  • Assess exposure based on inventory of Windows deployments
  • Monitor for potential exploitation attempts

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a vendor advisory with patch information. Affected versions and configurations are detailed in the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83882 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83882

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

  • CVE-2026-83882 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83882

    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-2026-83882.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83882

    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.