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PatchSiren cyber security CVE debrief

CVE-2026-42980 Microsoft CVE debrief

CVE-2026-42980 is a HIGH-severity vulnerability in the Windows NT OS Kernel. An authorized attacker can exploit this integer underflow (wrap or wraparound) vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7.8.

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
2026-07-29
Advisory published
2026-06-09
Advisory updated
2026-07-29

Who should care

Administrators and users of affected Microsoft Windows versions should prioritize patching this vulnerability to prevent local privilege escalation attacks.

Technical summary

The vulnerability exists in the Windows NT OS Kernel and is caused by an integer underflow (wrap or wraparound). This allows an authorized attacker to elevate privileges locally. The vulnerability is classified under CWE-122 and CWE-191.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Ensure all Windows systems are up-to-date with the latest security patches.
  • Restrict local access to sensitive systems and services.

Evidence notes

The CVE record and details are sourced from official databases.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42980 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42980

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

  • CVE-2026-42980 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42980

    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.