CVE-2026-40403
HighSummary
Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.
Risk Assessment
An attacker with appropriate permissions could exploit this vulnerability to execute malicious code, potentially leading to serious security breaches.
Recommendation
It is recommended to update the operating system to the latest version to patch this vulnerability and to monitor the system for unauthorized activities.
Other vulnerabilities in Windows Win32K - GRFX
See all- CVE-2026-34333High
A use after free vulnerability in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
- CVE-2026-34331High
There is a concurrent execution issue in Windows Win32K - GRFX due to improper synchronization, leading to a race condition. This allows an authorized attacker to elevate privileges locally.
- CVE-2025-26687High
A use after free vulnerability in Windows Win32K - GRFX allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-56176High
An out-of-bounds read vulnerability in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
- CVE-2026-44812High
An integer overflow vulnerability in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- CVE-2026-44803High
An integer overflow vulnerability in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- CVE-2026-33104High
A race condition in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally via concurrent execution of a shared resource without proper synchronization.
Original NVD description (English source)
Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.