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CVE-2026-46318

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"

This reverts commit ea52cb24cd3f ("mm/hugetlbfs: update hugetlbfs to use mmap_prepare") with conflict resolution to account for changes in commit ea52cb24cd3f ("mm/hugetlbfs: update hugetlbfs to use mmap_prepare").

The patch incorrectly handled hugetlb VMA lock allocation at the mmap_prepare stage, where a failed allocation occurring after mmap_prepare is called might result in the lock leaking.

There is no risk of a merge causing a similar issues, as VMA_DONTEXPAND_BIT is set for hugetlb mappings.

Leer descripción completaMostrar menos

As a first step in addressing this issue, simply revert the change so we can rework how we do this having corrected the underlying issues.

We maintain the VMA flags changes as best we can, accounting for the fact that we were working with a VMA descriptor previously and propagating like-for-like changes for this.

Note that we invoke vma_set_flags() and do not call vma_start_write() as vm_flags_set() does. This is OK as it's being done in an .mmap hook where the VMA is not yet linked into the tree so nobody else can be accessing it.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-46318",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "published": "2026-06-09T13:16:37.107",
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      "url": "https://git.kernel.org/stable/c/83f9efcce93f8574be2279090ee2aec58b86cda7",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"mm/hugetlbfs: update hugetlbfs to use mmap_prepare\"\n\nThis reverts commit ea52cb24cd3f (\"mm/hugetlbfs: update hugetlbfs to use\nmmap_prepare\") with conflict resolution to account for changes in commit\nea52cb24cd3f (\"mm/hugetlbfs: update hugetlbfs to use mmap_prepare\").\n\nThe patch incorrectly handled hugetlb VMA lock allocation at the\nmmap_prepare stage, where a failed allocation occurring after mmap_prepare\nis called might result in the lock leaking.\n\nThere is no risk of a merge causing a similar issues, as\nVMA_DONTEXPAND_BIT is set for hugetlb mappings.\n\nAs a first step in addressing this issue, simply revert the change so we\ncan rework how we do this having corrected the underlying issues.\n\nWe maintain the VMA flags changes as best we can, accounting for the fact\nthat we were working with a VMA descriptor previously and propagating\nlike-for-like changes for this.\n\nNote that we invoke vma_set_flags() and do not call vma_start_write() as\nvm_flags_set() does.  This is OK as it's being done in an .mmap hook where\nthe VMA is not yet linked into the tree so nobody else can be accessing\nit."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRevertir 'mm/hugetlbfs: update hugetlbfs to use mmap_prepare'\n\nEsto revierte el commit ea52cb24cd3f ('mm/hugetlbfs: update hugetlbfs to use mmap_prepare') con resolución de conflictos para tener en cuenta los cambios en el commit ea52cb24cd3f ('mm/hugetlbfs: update hugetlbfs to use mmap_prepare').\n\nEl parche manejó incorrectamente la asignación del bloqueo VMA de hugetlb en la etapa mmap_prepare, donde una asignación fallida que ocurre después de que se llama a mmap_prepare podría resultar en la fuga del bloqueo.\n\nNo hay riesgo de que una fusión cause problemas similares, ya que VMA_DONTEXPAND_BIT está configurado para las asignaciones de hugetlb.\n\nComo primer paso para abordar este problema, simplemente revertimos el cambio para que podamos reelaborar cómo hacemos esto habiendo corregido los problemas subyacentes.\n\nMantenemos los cambios de las banderas VMA lo mejor que podemos, teniendo en cuenta el hecho de que estábamos trabajando con un descriptor VMA anteriormente y propagando cambios equivalentes para esto.\n\nTenga en cuenta que invocamos vma_set_flags() y no llamamos a vma_start_write() como lo hace vm_flags_set(). Esto está bien ya que se está haciendo en un gancho .mmap donde el VMA aún no está vinculado al árbol, por lo que nadie más puede acceder a él."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "configurations": [
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