CVE-2026-43194 Linux内核GSO帧传输错误致连接死锁漏洞

#!/bin/bash # This script attempts to reproduce the environment for CVE-2026-43194 # It creates a veth pair, attaches an XDP program to force TSO off/NAPI on, # and generates traffic to potentially trigger the race condition/loss. if [ "$EUID" -ne 0 ]; then echo "Please run as root" exit fi # Load dependencies modprobe veth # Setup veth pair ip link add veth0 type veth peer name veth1 ip link set veth0 up ip link set veth1 up ip addr add 192.168.100.1/24 dev veth0 ip addr add 192.168.100.2/24 dev veth1 # Compile a simple XDP program that returns XDP_PASS cat > /tmp/xdp_pass.c <<EOF #include <linux/bpf.h> int xdp_pass_func(struct xdp_md *ctx) { return XDP_PASS; } char _license[] SEC("license") = "GPL"; EOF clang -O2 -g -target bpf -c /tmp/xdp_pass.c -o /tmp/xdp_pass.o # Attach XDP program to veth (forces NAPI/TSO off behavior) ip link set dev veth0 xdpgeneric obj /tmp/xdp_pass.o sec .text # Disable Qdisc to match the vulnerable condition described ip link set dev veth0 qdisc noqueue ip link set dev veth1 qdisc noqueue echo "Environment set up. Starting traffic..." # Generate traffic (e.g., using netperf or iperf, here simulated with ping/hping3) # Real exploitation requires specific packet loss timing. # This setup demonstrates the prerequisites. # Cleanup function cleanup() { ip link del veth0 rm -f /tmp/xdp_pass.c /tmp/xdp_pass.o } trap cleanup EXIT sleep 10