CVE-2026-43201 Linux Kernel APEI/GHES越界访问漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> // Simulating the kernel structure handling struct cper_arm_ctx_info { int size; // ... other fields ... }; // Simulated vulnerable logic from drivers/ras/ras.c void simulate_vulnerable_parse(struct cper_arm_ctx_info *ctx_info, int context_info_num, int buffer_size) { struct cper_arm_ctx_info *current = ctx_info; unsigned long ctx_len = 0; for (int n = 0; n < context_info_num; n++) { // Vulnerability: No check if (current + sz) exceeds allocated buffer_size int sz = sizeof(struct cper_arm_ctx_info) + current->size; // Move pointer based on untrusted size value current = (struct cper_arm_ctx_info *)((long)current + sz); ctx_len += sz; printf("Step %d: Pointer moved to %p, Total offset: %lu\n", n, current, ctx_len); // In a real kernel, accessing 'current' here if out of bounds causes an Oops/Panic if ((char *)current > (char *)ctx_info + buffer_size) { printf("[OOPS] Kernel panic: Out of bounds memory access!\n"); break; } } } int main() { // Allocate a small buffer to simulate a valid BIOS error record area const int BUFFER_SIZE = 64; char *buffer = malloc(BUFFER_SIZE); memset(buffer, 0, BUFFER_SIZE); struct cper_arm_ctx_info *fake_record = (struct cper_arm_ctx_info *)buffer; // Exploit: Set a size that forces the pointer arithmetic to go past the buffer fake_record->size = 200; // Malicious large size printf("Triggering CVE-2026-43201 PoC simulation...\n"); simulate_vulnerable_parse(fake_record, 1, BUFFER_SIZE); free(buffer); return 0; }