Sep 2026: Windows Secure Kernel Mode Elevation of Privilege Vulnerability
CVE-2026-85921 Published on September 14, 2026
Windows Secure Kernel Mode Elevation of Privilege Vulnerability
Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
Weakness Type
What is a Double-free Vulnerability?
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. When a program calls free() twice with the same argument, the program's memory management data structures become corrupted. This corruption can cause the program to crash or, in some circumstances, cause two later calls to malloc() to return the same pointer. If malloc() returns the same value twice and the program later gives the attacker control over the data that is written into this doubly-allocated memory, the program becomes vulnerable to a buffer overflow attack.
CVE-2026-85921 has been classified to as a Double-free vulnerability or weakness.
Products Associated with CVE-2026-85921
Want to know whenever a new CVE is published for Microsoft Windows 11 26h1? stack.watch will email you.
Affected Versions
Microsoft Windows 11 version 26H1:- Version 10.0.28000.0 and below 10.0.28000.2956 is affected.