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CVE-2024-49964 (GCVE-0-2024-49964)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-05-11 20:42
VLAI
Title
mm/hugetlb: fix memfd_pin_folios free_huge_pages leak
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:34 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 89c1905d9c140372b7f50ef48f42378cf85d9bc5 , < 59e081ff2e91bbf19b8c1ecb75b031f778858383 (git)
Affected: 89c1905d9c140372b7f50ef48f42378cf85d9bc5 , < c56b6f3d801d7ec8965993342bdd9e2972b6cb8e (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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