CVE-2026-31729 Linux Kernel UCSI越界访问漏洞

/* * Conceptual PoC for CVE-2026-31729 * This C code simulates the vulnerable logic in the Linux Kernel UCSI driver. * It demonstrates how a malicious connector number leads to an Out-of-Bounds access. */ #include <stdio.h> #include <stdlib.h> #define MAX_REAL_CONNECTORS 2 // Typical hardware allocation #define UCSI_MAX_CONNECTORS 127 // Max 7-bit value struct connector { int status; }; // Simulated vulnerable function void ucsi_connector_change_vulnerable(int connector_num, struct connector *con_array) { printf("[+] Accessing connector index: %d\n", connector_num); // VULNERABILITY: No bounds check before array access // If connector_num > MAX_REAL_CONNECTORS, this is OOB int status = con_array[connector_num].status; printf("[+] Connector status: %d\n", status); } int main() { // Allocate memory based on actual hardware (e.g., 2 connectors) struct connector *connectors = malloc(sizeof(struct connector) * MAX_REAL_CONNECTORS); // Initialize for(int i=0; i<MAX_REAL_CONNECTORS; i++) connectors[i].status = i; printf("--- Triggering Vulnerable Code ---\n"); // Attack vector: Malicious device sends connector number 100 int malicious_cci = 100; if (malicious_cci >= MAX_REAL_CONNECTORS) { printf("[!] Attempting Out-of-Bounds access!\n"); } // This will crash or read garbage/memory dump ucsi_connector_change_vulnerable(malicious_cci, connectors); free(connectors); return 0; }