CVE-2026-31569: Linux内核LoongArch KVM越界访问漏洞

/* * PoC Concept for CVE-2026-31569 * This is a conceptual representation demonstrating the vulnerability logic. * Triggering this requires a LoongArch system with KVM enabled. */ #include <stdio.h> #include <stdlib.h> // Mocking the kernel structure for demonstration struct phyid_map_entry { int state; }; struct kvm_arch_mock { struct phyid_map_entry phys_map[4]; // Assuming size is 4 based on cpuid >= 4 check }; // Vulnerable function logic simulation void eiointc_update_sw_coremap_vulnerable(struct kvm_arch_mock *arch, int coremap_is_empty) { int cpuid; if (coremap_is_empty) { // The bug: assigning -1 when coremap is empty cpuid = -1; printf("[+] Trigger condition met: coremap is empty. cpuid set to -1.\n"); } else { cpuid = 0; } printf("[+] Attempting to access phys_map at index: %d\n", cpuid); // Out-of-bounds access happens here // If cpuid is -1, this accesses memory before phys_map arch->phys_map[cpuid].state = 1; printf("[!] Access completed. System may crash or data leaked.\n"); } int main() { struct kvm_arch_mock mock_arch; // Initialize mock memory for(int i=0; i<4; i++) { mock_arch.phys_map[i].state = 0; } printf("Starting PoC for CVE-2026-31569...\n"); // Simulate the scenario where EIOINTC coremap is empty eiointc_update_sw_coremap_vulnerable(&mock_arch, 1); return 0; }