Use-after-free in Microsoft Windows - CVE-2026-105509
Published: November 10, 2026
Vulnerability identifier: #VU164643
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105509
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges to SYSTEM.
The vulnerability exists due to use-after-free in Windows Resilient File System (ReFS) when a race condition occurs. A local user can exploit access to freed memory to gain SYSTEM privileges.
Affected software
Microsoft Windows
How to mitigate CVE-2026-105509
Install security update from vendor's website.
Microsoft Windows - update to 11 26H1 10.0.28000.3501