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CVE-2026-45657: Windows Kernel Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-45657
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows KernelRemote code execution
What
A use after free vulnerability allows an unauthorized attacker to execute code over a network.
Who is affected
All users of the Windows Kernel are affected.
Urgency
Immediate remediation is critical due to the critical severity and potential for exploitation.
Action
Update to the latest Windows Kernel version to mitigate this vulnerability.

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
critical — CVSS 9.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657

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-2026-45657coverage & exploitation statusNVD · CVE.org

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