fkie_cve-2025-21655
Vulnerability from fkie_nvd
Published
2025-01-20 14:15
Modified
2025-01-20 14:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period\n\nio_eventfd_do_signal() is invoked from an RCU callback, but when\ndropping the reference to the io_ev_fd, it calls io_eventfd_free()\ndirectly if the refcount drops to zero. This isn\u0027t correct, as any\npotential freeing of the io_ev_fd should be deferred another RCU grace\nperiod.\n\nJust call io_eventfd_put() rather than open-code the dec-and-test and\nfree, which will correctly defer it another RCU grace period."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/eventfd: garantizar que io_eventfd_signal() posponga otro per\u00edodo de RCU io_eventfd_do_signal() se invoca desde una devoluci\u00f3n de llamada de RCU, pero al eliminar la referencia a io_ev_fd, llama a io_eventfd_free() directamente si El recuento cae a cero. Esto no es correcto, ya que cualquier posible liberaci\u00f3n de io_ev_fd deber\u00eda posponerse otro per\u00edodo de gracia de RCU. Simplemente llame a io_eventfd_put() en lugar de abrir el c\u00f3digo dec-and-test y free, lo que lo diferir\u00e1 correctamente a otro per\u00edodo de gracia de RCU."
    }
  ],
  "id": "CVE-2025-21655",
  "lastModified": "2025-01-20T14:15:27.027",
  "metrics": {},
  "published": "2025-01-20T14:15:27.027",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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