CVE-2024-42233

Summary

CVE-2024-42233: A vulnerability was identified in the Linux kernel's filemap component. The issue arose due to a race condition where the vmf->ptl pointer in filemap_fault_recheck_pte_none() was set using handle_pte_fault(), but then a pte_unmap(vmf->pte) and rcu_read_unlock() were performed, potentially leaving the page table unprotected. This could result in a use-after-free (UAF) condition if the PTL pointer became stale. The vulnerability has been addressed by replacing pte_offset_map() with pte_offset_map_nolock(). If the PTL fails to protect the page table, an issue previously resolved by commit 58f327f2ce80 might resurface.

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