CVE-2024-49964

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix memfd_pin_folios free_huge_pages leak memfd_pin_folios followed by unpin_folios fails to restore free_huge_pages if the pages were not already faulted in, because the folio refcount for pages created by memfd_alloc_folio never goes to 0. memfd_pin_folios needs another folio_put to undo the folio_try_get below: memfd_alloc_folio() alloc_hugetlb_folio_nodemask() dequeue_hugetlb_folio_nodemask() dequeue_hugetlb_folio_node_exact() folio_ref_unfreeze(folio, 1); ; adds 1 refcount folio_try_get() ; adds 1 refcount hugetlb_add_to_page_cache() ; adds 512 refcount (on x86) With the fix, after memfd_pin_folios + unpin_folios, the refcount for the (unfaulted) page is 512, which is correct, as the refcount for a faulted unpinned page is 513.

The following products are affected by CVE-2024-49964 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-49964.

URL	Resource
https://git.kernel.org/stable/c/59e081ff2e91bbf19b8c1ecb75b031f778858383
https://git.kernel.org/stable/c/c56b6f3d801d7ec8965993342bdd9e2972b6cb8e
https://lore.kernel.org/linux-cve-announce/2024102132-CVE-2024-49964-e06e@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-49964
https://www.cve.org/CVERecord?id=CVE-2024-49964