CVE-2026-20687 Apple内核内存管理释放后重用漏洞

/* * Conceptual PoC for Use-After-Free in Kernel Memory * This code demonstrates the logic of a UAF vulnerability. * Exploiting this in a real scenario requires heap grooming. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulating kernel object structure typedef struct _KernelObject { int id; char buffer[64]; void (*callback)(void); } KernelObject; // Malicious callback function to simulate kernel memory write/code execution void malicious_payload() { printf("[+] Exploit triggered: Executing arbitrary code in kernel context.\n"); // Hypothetical kernel memory write or privilege escalation } int main(int argc, char **argv) { printf("[*] Simulating CVE-2026-20687 PoC...\n"); // Step 1: Allocate kernel object KernelObject *k_obj = (KernelObject *)malloc(sizeof(KernelObject)); k_obj->id = 1; k_obj->callback = NULL; printf("[*] Kernel Object allocated at: %p\n", (void *)k_obj); // Step 2: Free the object (Vulnerability trigger: pointer not cleared) free(k_obj); printf("[*] Object freed.\n"); // Step 3: Heap Spray / Re-allocation to control freed memory // Attacker allocates memory that overlaps with the freed k_obj printf("[*] Attacker spraying heap to reclaim memory...\n"); char *fake_data = (char *)malloc(sizeof(KernelObject)); // Simulating the memory overlap (In real exploit, this requires precise timing) if ((void *)fake_data == (void *)k_obj) { printf("[+] Successfully reclaimed freed memory address.\n"); // Craft the fake object KernelObject *fake_obj = (KernelObject *)fake_data; fake_obj->callback = malicious_payload; printf("[*] malicious payload written to freed memory.\n"); // Step 4: Use-After-Free trigger // The kernel erroneously uses the freed pointer if (k_obj->callback != NULL) { printf("[*] Kernel calling virtual function via dangling pointer...\n"); k_obj->callback(); // Triggers malicious_payload } } else { printf("[-] Heap spray failed to reclaim specific address.\n"); } free(fake_data); return 0; }