fkie_cve-2022-48991
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-11-07 19:36
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcafPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/khugepaged: invoke MMU notifiers in shmem/file collapse paths\n\nAny codepath that zaps page table entries must invoke MMU notifiers to\nensure that secondary MMUs (like KVM) don\u0027t keep accessing pages which\naren\u0027t mapped anymore.  Secondary MMUs don\u0027t hold their own references to\npages that are mirrored over, so failing to notify them can lead to page\nuse-after-free.\n\nI\u0027m marking this as addressing an issue introduced in commit f3f0e1d2150b\n(\"khugepaged: add support of collapse for tmpfs/shmem pages\"), but most of\nthe security impact of this only came in commit 27e1f8273113 (\"khugepaged:\nenable collapse pmd for pte-mapped THP\"), which actually omitted flushes\nfor the removal of present PTEs, not just for the removal of empty page\ntables."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/khugepaged: invocar notificadores MMU en rutas de colapso de shmem/archivo Cualquier ruta de c\u00f3digo que elimine las entradas de la tabla de p\u00e1ginas debe invocar notificadores MMU para garantizar que las MMU secundarias (como KVM) no sigan accediendo a p\u00e1ginas que ya no est\u00e1n asignadas. Las MMU secundarias no mantienen sus propias referencias a p\u00e1ginas que se reflejan, por lo que no notificarlas puede provocar el use-after-free de la p\u00e1gina. Estoy marcando esto como una soluci\u00f3n a un problema introducido en el commit f3f0e1d2150b (\"khugepaged: agregar compatibilidad con el colapso para p\u00e1ginas tmpfs/shmem\"), pero la mayor parte del impacto de seguridad de esto solo se produjo en el commit 27e1f8273113 (\"khugepaged: habilitar el colapso pmd para THP asignado a pte\"), que en realidad omiti\u00f3 los vaciados para la eliminaci\u00f3n de PTE actuales, no solo para la eliminaci\u00f3n de tablas de p\u00e1ginas vac\u00edas."
    }
  ],
  "id": "CVE-2022-48991",
  "lastModified": "2024-11-07T19:36:33.167",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
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  "published": "2024-10-21T20:15:11.000",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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