CVE-2026-31451 Linux内核ext4拒绝服务漏洞

/* * Conceptual Proof of Concept for CVE-2026-31451 * This code demonstrates the logic that triggers the vulnerability. * Actual exploitation requires crafting a disk image with specific * ext4 inode structures where inline_data size > PAGE_SIZE. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> int main() { // Simulate the condition: Inline data size > PAGE_SIZE (4096 bytes) unsigned int page_size = 4096; unsigned int inline_data_size = page_size + 1; printf("Attempting to read inline folio with size: %d\n", inline_data_size); // In the vulnerable kernel, ext4_read_inline_folio would check: // BUG_ON(inline_data_size > PAGE_SIZE); // This triggers a kernel panic. if (inline_data_size > page_size) { printf("[VULNERABLE CONDITION MET] Kernel panic would occur here.\n"); printf("[FIXED BEHAVIOR] Reporting filesystem corruption (EFSCORRUPTED).\n"); } return 0; }