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CVE-2026-50300 Microsoft CVE debrief

An integer underflow vulnerability exists in the Windows Kernel, specifically affecting the Windows operating system. This issue allows an authorized local attacker to disclose sensitive information. The vulnerability is caused by an integer underflow (wrap or wraparound) condition. Microsoft has released a patch for this vulnerability. The vulnerability has a CVSS score of 5.5, indicating a medium severity level, with a vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. System administrators and users of Windows operating systems should be aware of this vulnerability and apply the available patch to mitigate the risk of information disclosure. The CVE record was published on 2026-07-14T17:16:58.640Z and last modified on 2026-07-16T16:19:11.550Z. The NVD entry is currently Analyzed.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
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 operating systems should be aware of this vulnerability. Applying the available patch is recommended to mitigate the risk of information disclosure.

Technical summary

The CVE-2026-50300 vulnerability is an integer underflow (wrap or wraparound) issue in the Windows Kernel. This vulnerability allows an authorized local attacker to disclose information. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 5.5, indicating a medium severity level. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Defensive priority

Medium priority should be given to patching this vulnerability, as it allows local information disclosure and has a medium CVSS score.

Recommended defensive actions

  • Apply the available patch from Microsoft to fix the integer underflow vulnerability in the Windows Kernel.
  • Ensure that all Windows operating systems are up-to-date with the latest security patches.
  • Monitor systems for any suspicious local activity that could be related to this vulnerability.

Evidence notes

The CVE-2026-50300 vulnerability was published on 2026-07-14T17:16:58.640Z and last modified on 2026-07-16T16:19:11.550Z. The NVD entry is currently Analyzed. Microsoft has provided a patch for this vulnerability, which is available through their update guide.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50300 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50300

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

  • CVE-2026-50300 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50300

    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.