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CVE-2026-69538 Microsoft CVE debrief

A Windows Spaceport.sys Remote Code Execution Vulnerability exists due to an out-of-bounds read in Windows Spaceport.sys, allowing an authorized attacker to execute code locally. Multiple Windows versions and editions are affected, including Windows 10, Windows 11, and Windows Server. The vulnerability allows authorized local attackers to execute code, potentially leading to system compromise and data breaches. Defenders and administrators of Windows systems should prioritize patching affected systems to prevent local code execution. The CVE Program and NVD provide official records of the vulnerability, and Microsoft has released a patch for the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
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

Defenders and administrators of Windows systems, particularly those responsible for patch management and vulnerability assessment, should prioritize patching affected systems to prevent local code execution.

Why it matters

CVE-2026-69538 is a Remote Code Execution Vulnerability in Windows Spaceport.sys that allows authorized local attackers to execute code. Defenders should prioritize patching affected Windows versions and editions to prevent potential system compromise.

  • Local code execution by authorized attackers
  • Potential system compromise and data breaches
  • Required patching and verification of system integrity

Technical summary

The vulnerability exists in Windows Spaceport.sys due to an out-of-bounds read, allowing authorized attackers to execute code locally. Affected versions include Windows 10 Version 1607, 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 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Defensive priority

Apply patches immediately for Windows Spaceport.sys Remote Code Execution Vulnerability

Recommended defensive actions

  • Apply patches for Windows Spaceport.sys Remote Code Execution Vulnerability
  • Inventory Windows versions and editions for exposure assessment
  • Verify patch application and system integrity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability exists in Windows Spaceport.sys due to an out-of-bounds read, allowing authorized attackers to execute code locally. Affected versions include Windows 10 Version 1607, 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, and

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69538 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69538

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

  • CVE-2026-69538 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69538

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

Supplemental references

  • Windows Spaceport.sys Remote Code Execution Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69538.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69538

    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.