fkie_cve-2025-37813
Vulnerability from fkie_nvd
Published
2025-05-08 07:15
Modified
2025-05-08 14:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix invalid pointer dereference in Etron workaround This check is performed before prepare_transfer() and prepare_ring(), so enqueue can already point at the final link TRB of a segment. And indeed it will, some 0.4% of times this code is called. Then enqueue + 1 is an invalid pointer. It will crash the kernel right away or load some junk which may look like a link TRB and cause the real link TRB to be replaced with a NOOP. This wouldn't end well. Use a functionally equivalent test which doesn't dereference the pointer and always gives correct result. Something has crashed my machine twice in recent days while playing with an Etron HC, and a control transfer stress test ran for confirmation has just crashed it again. The same test passes with this patch applied.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0624e29c595b05e7a0e6d1c368f0a05799928e30
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/142273a49f2c315eabdbdf5a71c15e479b75ca91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ea050da5562af9b930d17cbbe9632d30f5df43a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bce3055b08e303e28a8751f6073066f5c33a0744
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\nusb: xhci: Fix invalid pointer dereference in Etron workaround\n\nThis check is performed before prepare_transfer() and prepare_ring(), so\nenqueue can already point at the final link TRB of a segment. And indeed\nit will, some 0.4% of times this code is called.\n\nThen enqueue + 1 is an invalid pointer. It will crash the kernel right\naway or load some junk which may look like a link TRB and cause the real\nlink TRB to be replaced with a NOOP. This wouldn\u0027t end well.\n\nUse a functionally equivalent test which doesn\u0027t dereference the pointer\nand always gives correct result.\n\nSomething has crashed my machine twice in recent days while playing with\nan Etron HC, and a control transfer stress test ran for confirmation has\njust crashed it again. The same test passes with this patch applied."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: xhci: Corregir desreferencia de puntero no v\u00e1lida en el workaround de Etron Esta comprobaci\u00f3n se realiza antes de prepare_transfer() y prepare_ring(), por lo que enqueue ya puede apuntar al TRB de enlace final de un segmento. Y de hecho lo har\u00e1, alrededor del 0,4% de las veces que se llama a este c\u00f3digo. Entonces enqueue + 1 es un puntero no v\u00e1lido. Har\u00e1 que el kernel se caiga de inmediato o cargar\u00e1 algo basura que puede parecer un TRB de enlace y hacer que el TRB de enlace real se reemplace con un NOOP. Esto no terminar\u00eda bien. Utilice una prueba funcionalmente equivalente que no desreferencia el puntero y siempre d\u00e9 un resultado correcto. Algo ha hecho que mi m\u00e1quina se caiga dos veces en los \u00faltimos d\u00edas mientras jugaba con un Etron HC, y una prueba de estr\u00e9s de transferencia de control ejecutada para confirmaci\u00f3n la acaba de hacer caer de nuevo. La misma prueba pasa con este parche aplicado."
    }
  ],
  "id": "CVE-2025-37813",
  "lastModified": "2025-05-08T14:39:09.683",
  "metrics": {},
  "published": "2025-05-08T07:15:52.523",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0624e29c595b05e7a0e6d1c368f0a05799928e30"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/142273a49f2c315eabdbdf5a71c15e479b75ca91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ea050da5562af9b930d17cbbe9632d30f5df43a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bce3055b08e303e28a8751f6073066f5c33a0744"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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