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CVE-2026-42916 Microsoft CVE debrief

CVE-2026-42916 is a HIGH severity vulnerability in the Windows NT OS Kernel. An integer underflow (wrap or wraparound) allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-42916).

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-09
Advisory published
2026-06-09
Advisory updated
2026-07-09

Who should care

Administrators and users of Windows operating systems should be aware of this vulnerability, as it can allow an authorized attacker to elevate privileges locally.

Technical summary

The vulnerability is caused by an integer underflow (wrap or wraparound) in the Windows NT OS Kernel. This weakness, classified as CWE-190, can be exploited by an authorized attacker to elevate privileges locally.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable systems.
  • Ensure that all systems are running with the latest security updates and patches.
  • Monitor system logs for suspicious activity.

Evidence notes

The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. A list of affected versions can be found in the [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-42916) details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42916 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42916

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

  • CVE-2026-42916 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42916

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

Supplemental references

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.