Q: Given the following code slice:
```
1 static void make_uffd_wp_pte(struct vm_area_struct *vma,
2 			     unsigned long addr, pte_t *pte)
4 	pte_t ptent = ptep_get(pte);
6 	if (pte_present(ptent)) {
10 		ptent = pte_mkuffd_wp(ptent);```
which has a CWE-125 vulnerability at line:
```
10 		ptent = pte_mkuffd_wp(ptent);
```
Please analyze the root cause of the vulnerability.