CVE-2026-43272 Linux Kernel ring-buffer未初始化指针漏洞

/* * PoC Concept for CVE-2026-43272 * This code demonstrates the logic flow leading to the vulnerability. * Triggering the specific validation failure requires precise interaction * with the ring buffer subsystem (e.g., via ftrace/perf). */ #include <linux/module.h> #include <linux/kernel.h> // Mocking the vulnerable logic scenario void vulnerable_logic(int validation_status) { void *head_page; // Uninitialized pointer int orig_head; // Simulate the validation function call if (validation_status != 0) { // Control jumps to error handling goto invalid; } // Normal initialization path head_page = kmalloc(PAGE_SIZE, GFP_KERNEL); // ... normal operations ... return; invalid: // Vulnerability: head_page is used here without initialization // if jumped directly from the check above. printk(KERN_INFO "Accessing head_page: %p\n", head_page); } int init_module(void) { // Trigger the path vulnerable_logic(-1); return 0; } void cleanup_module(void) {} MODULE_LICENSE("GPL");