CVE-2026-43241: Linux内核ntb_hw_switchtec越界漏洞

/* * PoC Concept for CVE-2026-43241 * This code demonstrates the logic of the vulnerability. * Actual exploitation requires a specific hardware environment (Switchtec). */ #include <stdio.h> #include <stdlib.h> // Simulating the vulnerable structure #define MAX_MWS 10 // Example limit int mw_sizes[MAX_MWS]; // The array being accessed // Simulating the vulnerable function in ntb_hw_switchtec void vulnerable_ntb_config(int num_mws, int index) { // Vulnerability: Lack of bounds check on 'index' against 'num_mws' or MAX_MWS // The patch adds: if (index >= num_mws) return error; printf("Attempting to access mw_sizes index %d (Limit: %d)\n", index, num_mws); // This line causes the crash/leak if index is invalid int size = mw_sizes[index]; // Out-of-bounds access printf("MW Size: %d\n", size); } int main() { // Scenario: Configuration allows num_mws to be set such that // a specific valid-looking index is actually out of bounds for the array. // Or simply passing an index > MAX_MWS. printf("PoC: Triggering Array Index Out of Bounds\n"); // Initialize array for(int i=0; i<MAX_MWS; i++) mw_sizes[i] = i * 1024; // Trigger the bug with an invalid index // In the real vulnerability, this depends on NTB configuration logic. vulnerable_ntb_config(MAX_MWS, MAX_MWS + 1); return 0; }