CVE-2026-20451 MediaTek slbc类型混淆导致本地提权

// Conceptual PoC for Type Confusion leading to Out of Bounds Write // This code simulates the logic of the vulnerability. #include <stdio.h> #include <stdlib.h> #include <string.h> // Structure representing the smaller object struct SmallObject { int id; char name[8]; }; // Structure representing the larger object struct LargeObject { int id; long data; char buffer[16]; }; // Vulnerable function that assumes input is LargeObject based on a flag void vulnerable_function(void* input, int is_large) { if (is_large) { struct LargeObject* large = (struct LargeObject*)input; printf("Treating as LargeObject\n"); // This write will overflow if input was actually SmallObject large->data = 0xDEADBEEF; strcpy(large->buffer, "ExploitData"); } else { struct SmallObject* small = (struct SmallObject*)input; printf("Treating as SmallObject\n"); small->id = 1; } } int main() { // Allocation mimicking the vulnerable component's memory handling struct SmallObject* obj = (struct SmallObject*)malloc(sizeof(struct SmallObject)); obj->id = 100; printf("Original object size: %lu\n", sizeof(struct SmallObject)); // Triggering the type confusion: // Passing a SmallObject but telling the function it is a LargeObject. // This causes an Out of Bounds Write relative to the allocated memory. printf("Triggering vulnerability...\n"); vulnerable_function(obj, 1); free(obj); return 0; }