CVE-2026-43261 Linux内核TSV110 Spectre-BHB漏洞

#include <stdio.h> #include <stdint.h> // PoC Concept for Spectre-BHB on TSV110 // This code demonstrates the theoretical mechanism of // poisoning the Branch History Buffer (BHB). // Simulated array access uint8_t array1[64]; uint8_t array2[256 * 512]; size_t array1_size = 64; // Function vulnerable to speculation void speculative_access(size_t x) { // Boundary check that can be bypassed via speculation if (x < array1_size) { // Access array2 based on array1 content, leaving cache traces volatile uint8_t temp = array2[array1[x] * 512]; } } int main() { // In a real attack, the attacker would: // 1. Train the BHB to predict a specific path. // 2. Call speculative_access with an out-of-bounds x. // 3. Measure cache access times to array2 to determine the leaked byte. printf("[+] Testing Spectre-BHB susceptibility on local CPU...\n"); speculative_access(64); // Trigger with invalid input printf("[+] Check system logs for mitigation status.\n"); return 0; }