CVE-2026-31693 Linux内核CIFS重放请求缺失初始化漏洞

/* * Conceptual PoC for CVE-2026-31693 * This PoC demonstrates the logic to trigger CIFS replay mechanism. * Note: Actual exploitation requires specific kernel versions and environments. */ #include <stdio.h> #include <stdlib.h> #include <sys/mount.h> #include <unistd.h> int main() { printf("[+] Attempting to trigger CIFS replay logic...\n"); // 1. Setup: Attacker needs a way to interact with CIFS. // This usually involves mounting a share or accessing a mounted point. // In a real exploit, the attacker would control the network or the server. // 2. Trigger: Perform operations that induce a request replay. // This could involve network interruption or specific I/O patterns. // The goal is to hit the 'replay' label in the kernel code. // Example (Pseudo-code for interaction): // mount("//server/share", "/mnt/cifs", "cifs", 0, "user=guest"); // fd = open("/mnt/cifs/file", O_RDWR); // write(fd, data, size); // Trigger potential replay scenario printf("[!] If vulnerable, the kernel fails to initialize local variables on replay.\n"); printf("[!] This may lead to kernel panic or privilege escalation.\n"); return 0; }