PatchSiren

PatchSiren cyber security CVE debrief

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
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

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.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:58.640Z and has not been modified since then. The NVD entry is currently Analyzed.