CVE-2026-43192: Linux内核dm-mpath资源泄漏漏洞

/* * Conceptual PoC for CVE-2026-43192 * This code simulates the logic flow causing the reference leak. * Real exploitation requires a configured dm-mpath environment. */ #include <stdio.h> #include <stdlib.h> // Simulating kernel structures struct dm_dev { int ref_count; char name[32]; }; // Simulated kernel functions void dm_get_device(struct dm_dev *dev) { dev->ref_count++; printf("[+] dm_get_device called. Ref count: %d\n", dev->ref_count); } void dm_put_device(struct dm_dev *dev) { dev->ref_count--; printf("[-] dm_put_device called. Ref count: %d\n", dev->ref_count); } // Simulate scsi_dh_attached_handler_name returning -ENOMEM int scsi_dh_attached_handler_name() { printf("[!] scsi_dh_attached_handler_name failed (-ENOMEM)\n"); return -12; // -ENOMEM } // Vulnerable logic in parse_path void vulnerable_parse_path(struct dm_dev *path_dev) { dm_get_device(path_dev); // The vulnerable check: if this fails, cleanup is skipped if (scsi_dh_attached_handler_name() != 0) { // BUG: Missing dm_put_device(path_dev) here in the vulnerable version printf("[!] Error path taken, leaking device reference!\n"); return; } // Normal cleanup dm_put_device(path_dev); } int main() { struct dm_dev target = { .ref_count = 0, .name = "sda" }; printf("[*] Starting PoC for CVE-2026-43192\n"); printf("[*] Initial ref_count: %d\n", target.ref_count); // Trigger the vulnerability logic vulnerable_parse_path(&target); printf("[*] Final ref_count: %d\n", target.ref_count); if (target.ref_count > 0) { printf("[SUCCESS] Resource leaked! Reference count is non-zero.\n"); } else { printf("[FAIL] No resource leak detected.\n"); } return 0; }