# CVE-2024-35993: linux: In the Linux kernel, the following vulnerability has been resolved:  mm: turn folio_test_hugetlb into a PageType  The...

CVE-2024-35993 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-35993, released May 20, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-35993
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 20, 2024

## Description

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]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.9-1 | [DEBIAN-CVE-2024-35993](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35993.md) | May 20, 2024 |
| Linux | linux Debian 14 | 6.8.9-1 | [DEBIAN-CVE-2024-35993](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35993.md) | May 20, 2024 |

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