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CVE-2026-42980: NT OS Kernel Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-42980
Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows NT OS KernelPrivilege escalation
What
Integer underflow in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.
Who is affected
Authorized users of Windows NT OS Kernel.
Urgency
Remediation is urgent due to the high severity of the vulnerability.
Action
Apply the latest security patch provided by Microsoft.

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 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42980

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-2026-42980coverage & exploitation statusNVD · CVE.org

Recent advisories for NT OS Kernel

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