What is CVE-2026-64399?

CVE-2026-64399 is a security advisory published by Microsoft Security Response Center (MSRC). ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE

Which CVE IDs does CVE-2026-64399 cover?

CVE-2026-64399 covers the following CVE IDs: CVE-2026-64399. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

CVE-2026-64399

ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE

Vendor

Microsoft Security Response Center (MSRC)

Published

July 27, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-64399 →