Processor optimization removal or modification of security-critical code in Microsoft Windows and Windows Server - CVE-2026-84005
Published: November 11, 2026
Vulnerability identifier: #VU165539
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84005
CWE-ID: CWE-1037
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information transiently processed by an affected AMD Zen processor.
The vulnerability exists due to processor optimization removal or modification of security-critical code in AMD Zen processors when executing code. A local user can exploit this optimization behavior while running in another security context to infer data transiently processed by the affected processor.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-84005
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 1809 10.0.17763.9376, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650