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Windows Common Log File System Driver

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high advisory

Microsoft Security Updates — July 2026

Roundup of Microsoft security advisories published in July 2026.

PoC PowerShell +516 roundup
10c 227i updated
high advisory

CVE-2026-40407 - Windows CLFS Driver Heap Overflow for Privilege Escalation

CVE-2026-40407 is a heap-based buffer overflow vulnerability in the Windows Common Log File System (CLFS) Driver, enabling a locally authenticated attacker to escalate privileges on the system.

Windows Common Log File System Driver privilege-escalation heap-overflow windows
2r 1t 1c
high advisory

CVE-2026-40397: Windows CLFS Driver Integer Underflow Privilege Escalation

CVE-2026-40397 is an integer underflow vulnerability in the Windows Common Log File System (CLFS) driver that allows an authenticated attacker to escalate privileges locally.

Windows Common Log File System Driver privilege-escalation windows
2r 1t 1c