fkie_cve-2025-21655
Vulnerability from fkie_nvd
Published
2025-01-20 14:15
Modified
2025-02-23 08:15
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://project-zero.issues.chromium.org/issues/388499293
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't 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 período de RCU io_eventfd_do_signal() se invoca desde una devolución 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 liberación de io_ev_fd debería posponerse otro período de gracia de RCU. Simplemente llame a io_eventfd_put() en lugar de abrir el código dec-and-test y free, lo que lo diferirá correctamente a otro período de gracia de RCU.",
      },
   ],
   id: "CVE-2025-21655",
   lastModified: "2025-02-23T08:15:09.213",
   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",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://project-zero.issues.chromium.org/issues/388499293",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Awaiting Analysis",
}


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