Description

Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges with a physical attack.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.4",
  "pubDate": "2026-08-11T17:18:20.687Z",
  "pubdate": "2026-08-11T17:18:20.687Z",
  "executiveSummary": "A use-after-free vulnerability exists within the Windows Kernel, allowing an unauthorized attacker to achieve local privilege escalation via a physical attack vector. The flaw resides in memory management handling within the kernel subsystem, where improper lifecycle management of allocated objects leads to dangling pointers.\nSuccessful exploitation of this vulnerability enables an unauthenticated attacker with physical access to execute arbitrary code in the context of the kernel, resulting in full system compromise. The primary impact involves bypassing security boundaries to elevate privileges from standard user levels to highest-privilege execution contexts.\nPrerequisites for this attack include physical proximity to the target system to facilitate the specific physical interaction vector required to trigger the race condition or memory corruption state. Risk implications are severe, as kernel-level compromise grants complete control over the operating system, bypassing all software-based isolation mechanisms.\nOrganizations operating affected Windows Kernel versions must rely on physical security controls and hardware-based protections, as standard remote mitigations do not apply to locally executed physical attack vectors.",
  "technicalDetails": "The vulnerability is a classic use-after-free (UAF) condition instantiated within the Windows Kernel memory management components. A UAF vulnerability occurs when the program continues to use a pointer after the memory allocation associated with it has been freed or reallocated. This typically arises from flawed reference counting logic or improper synchronization in multithreaded kernel routines.\nIn the context of this flaw, the attack flow begins with the malicious actor establishing physical interaction with the target hardware. Through targeted physical manipulation—such as direct memory access (DMA) vectors, peripheral device interaction, or specific hardware-triggered interrupt sequences—the attacker forces the kernel to deallocate a specific object while retaining a valid reference pointer to the freed memory region.\nFollowing the premature deallocation, the attacker performs heap feng shui or memory grooming techniques to allocate controlled data into the exact memory slot previously occupied by the freed kernel object. When the kernel subsequently attempts to access the dangling pointer, it processes the attacker-controlled data as if it were the original legitimate object.\nBecause the vulnerable component executes with high privileges in ring 0, the dereference of the manipulated pointer redirects control flow to attacker-specified instruction sequences. This payload behavior allows the execution of arbitrary kernel-mode code, effectively bypassing all user-mode and kernel-mode access control lists.\nThe affected component is the core Windows Kernel memory subsystem. The vulnerability requires no prior authentication or initial high privileges, but strictly mandates physical access to the target machine to initiate the low-level interactions necessary to trigger the race condition or hardware-mediated memory corruption state. Post-exploitation impact includes complete confidentiality, integrity, and availability loss of the host operating system."
}