CVE-2024-35993 (GCVE-0-2024-35993)

Vulnerability from cvelistv5 – Published: 2024-05-20 09:47 – Updated: 2025-05-04 09:10
VLAI?
Title
mm: turn folio_test_hugetlb into a PageType
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: turn folio_test_hugetlb into a PageType The current folio_test_hugetlb() can be fooled by a concurrent folio split into returning true for a folio which has never belonged to hugetlbfs. This can't happen if the caller holds a refcount on it, but we have a few places (memory-failure, compaction, procfs) which do not and should not take a speculative reference. Since hugetlb pages do not use individual page mapcounts (they are always fully mapped and use the entire_mapcount field to record the number of mappings), the PageType field is available now that page_mapcount() ignores the value in this field. In compaction and with CONFIG_DEBUG_VM enabled, the current implementation can result in an oops, as reported by Luis. This happens since 9c5ccf2db04b ("mm: remove HUGETLB_PAGE_DTOR") effectively added some VM_BUG_ON() checks in the PageHuge() testing path. [willy@infradead.org: update vmcoreinfo]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a , < 2431b5f2650dfc47ce782d1ca7b02d6b3916976f (git)
Affected: 9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a , < 9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32 (git)
Affected: 9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a , < d99e3140a4d33e26066183ff727d8f02f56bec64 (git)
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    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.30 , ≤ 6.6.* (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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