CVE-2026-31628: Linux内核Zen1处理器硬件除法器信息泄露漏洞

// PoC for CVE-2026-31628 (Conceptual) // This code demonstrates the context required to leak divider state. #include <stdio.h> #include <pthread.h> #include <unistd.h> // Simulate a victim thread performing division void* victim_func(void* arg) { volatile double result = 12345.67 / 89.0; // The hardware divider may hold residue of this operation printf("[Victim] Performed division."); return NULL; } // Simulate an attacker thread trying to read residue void* attacker_func(void* arg) { // Attempt to perform division and check for timing/state anomalies // indicating leakage from the victim thread. volatile double probe = 0.0; // In a real exploit, specific microarchitectural probing would occur here. printf("[Attacker] Probing hardware divider state..."); return NULL; } int main() { pthread_t v, a; // Run threads on the same core to exploit the hardware flaw pthread_create(&v, NULL, victim_func, NULL); pthread_join(v, NULL); pthread_create(&a, NULL, attacker_func, NULL); pthread_join(a, NULL); return 0; }