Description

Use after free in Windows Graphics Kernel allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.0",
  "pubDate": "2026-08-11T17:18:08.910Z",
  "pubdate": "2026-08-11T17:18:08.910Z",
  "executiveSummary": "A use-after-free vulnerability exists within the Windows Graphics Kernel, potentially allowing an authorized local attacker to achieve local privilege escalation. This security flaw arises from improper memory management within the kernel-mode driver handling graphic objects and resources. If successfully exploited, an adversary can manipulate dangling pointers to execute arbitrary code in kernel space, bypassing standard operating system security boundaries and gaining SYSTEM-level privileges.\nThe vulnerability affects Windows systems utilizing the vulnerable Windows Graphics Kernel component. Exploitation requires the attacker to have local access and authorization to execute code on the target machine, meaning initial access or a lower-privileged user context is a prerequisite. The risk implications are severe, as a successful exploit compromises the confidentiality, integrity, and availability of the entire host system, allowing complete control over the underlying operating system.\nGiven the kernel-level nature of the vulnerability, standard user-mode mitigations may be insufficient, necessitating official security updates from the vendor. Organizations should prioritize applying official patches released by Microsoft to address this use-after-free condition and ensure robust endpoint protection mechanisms are active to detect anomalous kernel-mode behavior.",
  "technicalDetails": "The vulnerability is classified as a use-after-free condition residing in the Windows Graphics Kernel component. The root cause stems from a memory management flaw where kernel-mode objects are deallocated or freed, but references to these memory addresses persist within the driver's internal data structures. When a subsequent operation attempts to access the object via the stale pointer, a use-after-free condition occurs.\nExploitation of this vulnerability involves precise heap manipulation and memory grooming by a local attacker. The attack flow typically begins with the execution of a malicious user-mode application that interacts with the Windows Graphics Kernel via system calls and graphics device interface (GDI) or DirectX APIs. The attacker induces a scenario where a specific graphics object is freed while simultaneously retaining a handle or reference to it. By strategically allocating new data into the newly freed heap location (heap feng-shui), the attacker can overlap controlled data with the original object's memory footprint.\nWhen the kernel subsequently dereferences the dangling pointer, it processes the attacker-controlled data as if it were a valid kernel object. This can lead to type confusion, arbitrary read and write primitives, or control flow hijacking. Since the vulnerable component operates in kernel mode (Ring 0), the payload behavior during successful exploitation includes modifying kernel structures, disabling security mitigations, injecting malicious drivers, or spawning unauthorized processes with SYSTEM privileges.\nPrerequisites for exploitation include local access to the target system and the ability to execute code. No network exposure is required, as the attack vector is strictly local. Authentication and standard user privileges are sufficient to initiate the interaction with the Windows Graphics Kernel, after which the flaw is leveraged to elevate privileges locally."
}