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CVE-2026-49798: Windows Kernel Elevation of Privilege Vulnerability

criticalCVSS 9.3CVE-2026-49798
Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows KernelPrivilege escalation
What
Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
Who is affected
Deployments of Windows Kernel.
Urgency
Remediation is critical due to the high severity and potential for privilege escalation.
Action
Apply the latest security patch for Windows Kernel.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.3
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49798

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-49798coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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.

More from Microsoft Security Response Center