FKIE_CVE-2024-44947

Vulnerability from fkie_nvd - Published: 2024-09-02 18:15 - Updated: 2025-11-03 23:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: Initialize beyond-EOF page contents before setting uptodate fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents). So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate. The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap(). This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49934861514d36d0995be8e81bb3312a499d8d9aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://project-zero.issues.chromium.org/issues/42451729
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
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 6.11
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\nfuse: Initialize beyond-EOF page contents before setting uptodate\n\nfuse_notify_store(), unlike fuse_do_readpage(), does not enable page\nzeroing (because it can be used to change partial page contents).\n\nSo fuse_notify_store() must be more careful to fully initialize page\ncontents (including parts of the page that are beyond end-of-file)\nbefore marking the page uptodate.\n\nThe current code can leave beyond-EOF page contents uninitialized, which\nmakes these uninitialized page contents visible to userspace via mmap().\n\nThis is an information leak, but only affects systems which do not\nenable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the\ncorresponding kernel command line parameter)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fuse: inicializar el contenido de la p\u00e1gina m\u00e1s all\u00e1 del EOF antes de configurar uptodate fuse_notify_store(), a diferencia de fuse_do_readpage(), no habilita la puesta a cero de la p\u00e1gina (porque se puede usar para cambiar el contenido parcial de la p\u00e1gina). Por lo tanto, fuse_notify_store() debe ser m\u00e1s cuidadoso para inicializar por completo el contenido de la p\u00e1gina (incluidas las partes de la p\u00e1gina que est\u00e1n m\u00e1s all\u00e1 del fin del archivo) antes de marcar la p\u00e1gina como actualizada. El c\u00f3digo actual puede dejar el contenido de la p\u00e1gina m\u00e1s all\u00e1 del EOF sin inicializar, lo que hace que este contenido de p\u00e1gina no inicializado sea visible para el espacio de usuario a trav\u00e9s de mmap(). Esta es una fuga de informaci\u00f3n, pero solo afecta a los sistemas que no habilitan init-on-alloc (a trav\u00e9s de CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y o el par\u00e1metro de l\u00ednea de comandos del kernel correspondiente)."
    }
  ],
  "id": "CVE-2024-44947",
  "lastModified": "2025-11-03T23:15:43.733",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-09-02T18:15:36.577",
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-665"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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