CVE-2024-47676: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway

First published: Mon Oct 21 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway Syzbot reports a UAF in hugetlb_fault(). This happens because vmf_anon_prepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlb_vma_unlock_read() is called. We can fix this by using a modified version of vmf_anon_prepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlb_vma_unlock_read().

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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