# CVE-2024-49964: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/hugetlb: fix memfd_pin_folios free_huge_pages...

CVE-2024-49964 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49964, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49964
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49964](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49964.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49964](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49964.md) | Oct 21, 2024 |

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