FKIE_CVE-2024-57881

Vulnerability from fkie_nvd - Published: 2025-01-11 16:15 - Updated: 2025-10-01 20:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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: mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy() In split_large_buddy(), we might call pfn_to_page() on a PFN that might not exist. In corner cases, such as when freeing the highest pageblock in the last memory section, this could result with CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and and __section_mem_map_addr() dereferencing that NULL pointer. Let's fix it, and avoid doing a pfn_to_page() call for the first iteration, where we already have the page. So far this was found by code inspection, but let's just CC stable as the fix is easy.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4234ca9884bcae9e48ed38652d91696ad5cd591dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/faeec8e23c10bd30e8aa759a2eb3018dae00f924Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: don\u0027t call pfn_to_page() on possibly non-existent PFN in split_large_buddy()\n\nIn split_large_buddy(), we might call pfn_to_page() on a PFN that might\nnot exist.  In corner cases, such as when freeing the highest pageblock in\nthe last memory section, this could result with CONFIG_SPARSEMEM \u0026\u0026\n!CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and and\n__section_mem_map_addr() dereferencing that NULL pointer.\n\nLet\u0027s fix it, and avoid doing a pfn_to_page() call for the first\niteration, where we already have the page.\n\nSo far this was found by code inspection, but let\u0027s just CC stable as the\nfix is easy."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/page_alloc: no llamar a pfn_to_page() en PFN posiblemente inexistente en split_large_buddy() En split_large_buddy(), podr\u00edamos llamar a pfn_to_page() en un PFN que podr\u00eda no existir. En casos especiales, como al liberar el bloque de p\u00e1gina m\u00e1s alto en la \u00faltima secci\u00f3n de memoria, esto podr\u00eda resultar en que CONFIG_SPARSEMEM \u0026amp;\u0026amp; !CONFIG_SPARSEMEM_EXTREME en __pfn_to_section() devuelva NULL y __section_mem_map_addr() desreferenciando ese puntero NULL. Vamos a solucionarlo y evitar hacer una llamada a pfn_to_page() para la primera iteraci\u00f3n, donde ya tenemos la p\u00e1gina. Hasta ahora esto se encontr\u00f3 mediante inspecci\u00f3n de c\u00f3digo, pero simplemente controlemos CC estable ya que la soluci\u00f3n es f\u00e1cil."
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  "id": "CVE-2024-57881",
  "lastModified": "2025-10-01T20:18:00.020",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
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  "published": "2025-01-11T16:15:24.307",
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