CVE-2026-43449: Linux内核nvme-pci越界读漏洞

/* * Conceptual PoC for CVE-2026-43449 * This snippet demonstrates the logic error in the loop condition. */ #include <stdio.h> #define MAX_QUEUES 10 struct device { int online_queues; void *queue_ptr[MAX_QUEUES]; }; // Vulnerable Logic Simulation void vulnerable_nvme_dbbuf_set(struct device *dev) { printf("[VULN] Attempting to set doorbell buffers...\n"); // BUG: The loop condition uses <= instead of < // valid indices are 0 to dev->online_queues - 1 for (int i = 1; i <= dev->online_queues; i++) { printf("Accessing index %d (Out of bounds if i == online_queues)\n", i); // This would cause slab-out-of-bounds read in kernel // char data = *(char*)(dev->queue_ptr[i]); } } // Patched Logic Simulation void patched_nvme_dbbuf_set(struct device *dev) { printf("[PATCH] Setting doorbell buffers safely...\n"); // FIX: Use strict less than comparison for (int i = 1; i < dev->online_queues; i++) { printf("Accessing index %d (Safe)\n", i); } } int main() { struct device dev; dev.online_queues = 5; // Valid indices: 0, 1, 2, 3, 4 printf("Simulating Vulnerability...\n"); vulnerable_nvme_dbbuf_set(&dev); printf("\nSimulating Patch...\n"); patched_nvme_dbbuf_set(&dev); return 0; }