CVE-2026-43171 Linux内核EFI/CPER内存越界漏洞

/* * PoC for CVE-2026-43171 (Conceptual) * This code demonstrates the integer underflow logic present in * cper_print_fw_err(). It simulates the condition where the offset * is larger than the record length. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> void simulate_vulnerability(size_t record_len, size_t offset) { printf("[+] Simulating cper_print_fw_err logic\n"); printf(" Record Length: %zu\n", record_len); printf(" Offset: %zu\n", offset); // The vulnerable logic: length -= offset without bounds check size_t len_to_dump = record_len - offset; printf(" Calculated Dump Length: %zu\n", len_to_dump); if (len_to_dump > record_len) { printf("[!] Integer underflow detected!\n"); printf("[!] Kernel would attempt to dump massive memory region.\n"); printf("[!] Potential Impact: Information Disclosure, DoS (OOPS).\n"); } } int main() { // Scenario: Malicious firmware provides an offset larger than the record size_t legitimate_len = 100; size_t malicious_offset = 200; simulate_vulnerability(legitimate_len, malicious_offset); return 0; }