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CVE-2026-42984 Microsoft CVE debrief

CVE-2026-42984 is a high-severity vulnerability in the Windows Kernel that allows an authorized attacker to elevate privileges locally. This use-after-free vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. The vulnerability was published on 2026-06-09T17:17:14.347Z and modified on 2026-06-10T19:37:03.870Z.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Administrators and users of Microsoft Windows operating systems should be aware of this vulnerability, especially those with elevated privileges.

Technical summary

The vulnerability is a use-after-free issue in the Windows Kernel, which allows an authorized attacker to elevate privileges locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Review and update Windows operating systems to the latest versions.
  • Implement additional security measures to restrict local access to sensitive areas of the system.

Evidence notes

The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. A list of affected versions can be found in the CVE details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42984 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42984

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

  • CVE-2026-42984 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42984

    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.