fkie_cve-2024-38580
Vulnerability from fkie_nvd
Published
2024-06-19 14:15
Modified
2025-10-20 22:09
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: epoll: be better about file lifetimes epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless. Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016ePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9
linux linux_kernel 6.9


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nepoll: be better about file lifetimes\n\nepoll can call out to vfs_poll() with a file pointer that may race with\nthe last \u0027fput()\u0027. That would make f_count go down to zero, and while\nthe ep-\u003emtx locking means that the resulting file pointer tear-down will\nbe blocked until the poll returns, it means that f_count is already\ndead, and any use of it won\u0027t actually get a reference to the file any\nmore: it\u0027s dead regardless.\n\nMake sure we have a valid ref on the file pointer before we call down to\nvfs_poll() from the epoll routines."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: epoll: mejore la duraci\u00f3n de los archivos epoll puede llamar a vfs_poll() con un puntero de archivo que puede competir con el \u00faltimo \u0027fput()\u0027. Eso har\u00eda que f_count bajara a cero, y aunque el bloqueo ep-\u0026gt;mtx significa que el desmontaje del puntero del archivo resultante se bloquear\u00e1 hasta que regrese la encuesta, significa que f_count ya est\u00e1 muerto y no se podr\u00e1 utilizar. De hecho, ya no obtengo una referencia al archivo: est\u00e1 muerto de todos modos. Aseg\u00farese de tener una referencia v\u00e1lida en el puntero del archivo antes de llamar a vfs_poll() desde las rutinas de epoll."
    }
  ],
  "id": "CVE-2024-38580",
  "lastModified": "2025-10-20T22:09:26.253",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-06-19T14:15:18.057",
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  "vulnStatus": "Analyzed",
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}


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