# CVE-2024-40950: linux: In the Linux kernel, the following vulnerability has been resolved:  mm: huge_memory: fix misused mapping_large_folio...

CVE-2024-40950 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-40950, released July 12, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-40950
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 12, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm: huge_memory: fix misused mapping_large_folio_support() for anon folios  When I did a large folios split test, a WARNING "[ 5059.122759][ T166] Cannot split file folio to non-0 order" was triggered.  But the test cases are only for anonmous folios.  while mapping_large_folio_support() is only reasonable for page cache folios.  In split_huge_page_to_list_to_order(), the folio passed to mapping_large_folio_support() maybe anonmous folio.  The folio_test_anon() check is missing.  So the split of the anonmous THP is failed.  This is also the same for shmem_mapping().  We'd better add a check for both.  But the shmem_mapping() in __split_huge_page() is not involved, as for anonmous folios, the end parameter is set to -1, so (head[i].index >= end) is always false.  shmem_mapping() is not called.  Also add a VM_WARN_ON_ONCE() in mapping_large_folio_support() for anon mapping, So we can detect the wrong use more easily.  THP folios maybe exist in the pagecache even the file system doesn't support large folio, it is because when CONFIG_TRANSPARENT_HUGEPAGE is enabled, khugepaged will try to collapse read-only file-backed pages to THP.  But the mapping does not actually support multi order large folios properly.  Using /sys/kernel/debug/split_huge_pages to verify this, with this patch, large anon THP is successfully split and the warning is ceased.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-40950](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40950.md) | Jul 12, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-40950](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40950.md) | Jul 12, 2024 |

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