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PatchSiren cyber security CVE debrief

CVE-2026-45640 Microsoft CVE debrief

CVE-2026-45640 is a high-severity vulnerability in the Windows Bluetooth Port Driver. It is caused by a use-after-free weakness, which allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH severity.

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Administrators and users of Windows operating systems should be aware of this vulnerability, especially those with local access to the system.

Technical summary

The vulnerability is caused by a use-after-free weakness in the Windows Bluetooth Port Driver. This allows an authorized attacker to elevate privileges locally. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7, indicating a high level of severity.

Defensive priority

High

Recommended defensive actions

  • Apply the patch from Microsoft as soon as possible.
  • Review and implement secure coding practices to prevent similar vulnerabilities in the future.

Evidence notes

The vulnerability was published on June 9, 2026, and modified on June 11, 2026. The CVE record and NVD detail pages provide additional information about the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45640 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45640

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

  • CVE-2026-45640 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45640

    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.