fkie_cve-2024-46838
Vulnerability from fkie_nvd
Published
2024-09-27 13:15
Modified
2024-10-09 15:35
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: don't BUG_ON() if khugepaged yanks our page table Since khugepaged was changed to allow retracting page tables in file mappings without holding the mmap lock, these BUG_ON()s are wrong - get rid of them. We could also remove the preceding "if (unlikely(...))" block, but then we could reach pte_offset_map_lock() with transhuge pages not just for file mappings but also for anonymous mappings - which would probably be fine but I think is not necessarily expected.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a594acc12d5954cdc71d4450a386748bf3d136aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db978287e908d48b209e374b00d847b2d785e0a9Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: don\u0027t BUG_ON() if khugepaged yanks our page table\n\nSince khugepaged was changed to allow retracting page tables in file\nmappings without holding the mmap lock, these BUG_ON()s are wrong - get\nrid of them.\n\nWe could also remove the preceding \"if (unlikely(...))\" block, but then we\ncould reach pte_offset_map_lock() with transhuge pages not just for file\nmappings but also for anonymous mappings - which would probably be fine\nbut I think is not necessarily expected."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: userfaultfd: no ejecutar BUG_ON() si khugepaged extrae nuestra tabla de p\u00e1ginas Dado que khugepaged se modific\u00f3 para permitir la extracci\u00f3n de tablas de p\u00e1ginas en asignaciones de archivos sin mantener el bloqueo mmap, estos BUG_ON() son incorrectos: desh\u00e1gase de ellos. Tambi\u00e9n podr\u00edamos eliminar el bloque \"if (unlikely(...))\" anterior, pero entonces podr\u00edamos llegar a pte_offset_map_lock() con p\u00e1ginas transhuge no solo para asignaciones de archivos sino tambi\u00e9n para asignaciones an\u00f3nimas, lo que probablemente estar\u00eda bien, pero creo que no es necesariamente lo esperado."
    }
  ],
  "id": "CVE-2024-46838",
  "lastModified": "2024-10-09T15:35:40.827",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-09-27T13:15:15.920",
  "references": [
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  "vulnStatus": "Analyzed",
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          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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