CVE-2026-43030 Linux内核BPF regsafe()指针验证漏洞

// Conceptual PoC for CVE-2026-43030 // This code demonstrates how to load a crafted eBPF program // intended to trigger the regsafe() logic bug. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <linux/bpf.h> #include <bpf/bpf.h> int main(int argc, char **argv) { // In a real exploit, 'insns' would contain bytecode specifically // crafted to hit the condition: rold->reg->range == BEYOND_PKT_END // && rcur->reg->range == N struct bpf_insn insns[] = { // Placeholder instructions for packet access BPF_MOV64_REG(BPF_REG_1, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8), BPF_EXIT_INSN(), }; printf("[*] Attempting to load crafted eBPF program...\n"); // Logic to load program via bpf() syscall would go here // If the bug is triggered, the verifier state exploration is bypassed. printf("[*] PoC execution finished.\n"); return 0; }