Exploit for Improper Privilege Management in Google Chrome

## https://sploitus.com/exploit?id=97690D7B-78DA-5BA3-9E52-6C3DAEBB1CF4
---

## CVE-2026-11108 – Integer Overflow in Memory Allocator (kmalloc Sim)

### Program Code (C)

```c
// alloc_sim.c - Vulnerable memory allocator
#include 
#include 
#include 

#define MAX_BLOCK 1024

void *my_malloc(size_t size) {
    size_t total = size + sizeof(size_t); // header
    if (total > MAX_BLOCK) return NULL;
    void *ptr = malloc(total);
    if (!ptr) return NULL;
    *(size_t *)ptr = size;
    return ptr + sizeof(size_t);
}

void my_free(void *p) {
    if (!p) return;
    size_t *header = (size_t *)(p - sizeof(size_t));
    free(header);
}

int main() {
    // Craft size that causes integer overflow: 0xFFFFFFFF - sizeof(size_t) + 1 wraps to small number
    size_t huge = 0xFFFFFFFF;  // 4GB - 1
    char *buf = my_malloc(huge - sizeof(size_t) + 1); // overflow: total becomes 0?
    if (buf) {
        // Write far beyond allocated buffer, heap overflow
        memset(buf, 'A', 1000);
        printf("Wrote 1000 bytes to tiny buffer\n");
        my_free(buf);
    }
    return 0;
}

```

# CVE-2026-11108 – Integer Overflow in Memory Allocator

![Severity: Critical](https://img.shields.io/badge/severity-critical-red)

## Overview
A custom memory allocator incorrectly calculates the total allocation size by adding a header size without overflow checks. By passing a size near `UINT_MAX`, the total wraps to a small value, allocating a tiny buffer but allowing a large write, causing a heap overflow.

## Vulnerability Details
- **Type:** Integer Overflow / Heap Overflow
- **Impact:** Arbitrary code execution, memory corruption.
- **Root Cause:** The allocation function fails to check for overflow when adding the header size to the user-requested size.

## Exploit Demonstration
Compile and run:
```bash
gcc -o alloc_sim alloc_sim.c -fno-stack-protector
./alloc_sim
```

The program writes far more bytes than the allocated buffer, corrupting heap metadata and likely crashing.