# CVE-2024-39477: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/hugetlb: do not call vma_add_reservation upon...

CVE-2024-39477 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-39477, released July 5, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-39477
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 5, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/hugetlb: do not call vma_add_reservation upon ENOMEM  sysbot reported a splat [1] on __unmap_hugepage_range().  This is because vma_needs_reservation() can return -ENOMEM if allocate_file_region_entries() fails to allocate the file_region struct for the reservation.  Check for that and do not call vma_add_reservation() if that is the case, otherwise region_abort() and region_del() will see that we do not have any file_regions.  If we detect that vma_needs_reservation() returned -ENOMEM, we clear the hugetlb_restore_reserve flag as if this reservation was still consumed, so free_huge_folio() will not increment the resv count.  [1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-39477](https://patchblox.com/security/data/fix/linux/debian-cve-2024-39477.md) | Jul 5, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-39477](https://patchblox.com/security/data/fix/linux/debian-cve-2024-39477.md) | Jul 5, 2024 |

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