CVE-2026-50390: Windows Kernel Elevation of Privilege Vulnerability

highCVSS 7CVE-2026-50390

Access of resource using incompatible type ('type confusion') in Windows Kernel allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoft product: Windows Kernel Privilege escalation

What: Type confusion in Windows Kernel allows an authorized attacker to elevate privileges locally.
Who is affected: Users of the Windows Kernel.
Urgency: Remediation is high urgency due to the potential for local privilege escalation.
Action: Apply the latest security updates for the Windows Kernel.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50390

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-503900.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50390	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

critical[NEW] [critical] Microsoft Windows products: Multiple vulnerabilitiescert-bund
highCVE-2026-50390: Access of resource using incompatible type ('type confusion') in Windows Kernel allows an auth…nvd
unknownexploitedNCSC-2026-0231 [1.00] [M/H] Vulnerabilities fixed in Microsoft Windowsncsc-nl

Recent advisories for Windows Kernel Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-58532: Integer overflow or wraparound in Windows Kernel allows an authorized attacker to elevate priv…nvd · 2026-07-14
highCVE-2026-56644: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.nvd · 2026-07-14
highCVE-2026-56643: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.nvd · 2026-07-14
highCVE-2026-50688: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.nvd · 2026-07-14
highCVE-2026-50687: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.nvd · 2026-07-14
highCVE-2026-50673: Null pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges…nvd · 2026-07-14