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CVE-2026-56644 Microsoft CVE debrief

CVE-2026-56644 is a high-severity vulnerability in the Windows Kernel, classified as a use-after-free issue. This vulnerability allows an authorized attacker to elevate privileges locally. The affected products include Windows 10, Windows 11, and Windows Server systems. Microsoft has released a patch for this vulnerability, and system administrators should prioritize applying this patch. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and take steps to apply the patch. This vulnerability has a high CVSS score and is classified as HIGH severity, indicating a significant risk to affected systems.

Technical summary

The vulnerability is a use-after-free issue in the Windows Kernel, which allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The affected products include Windows 10, Windows 11, and Windows Server systems. Microsoft has released a patch for this vulnerability, and system administrators should prioritize applying this patch.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all Windows systems are up-to-date with the latest security patches
  • Monitor systems for suspicious activity
  • Implement additional security measures such as least privilege access and network segmentation
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. Microsoft has released a patch for this vulnerability. Evidence limits suggest that affected scope and exploitation details remain unverified. Defenders should verify patch deployment status and review system logs for potential suspicious activity related to this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56644 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56644

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

  • CVE-2026-56644 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56644

    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.