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CVE-2024-57981

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

usb: xhci: Fix NULL pointer dereference on certain command aborts

If a command is queued to the final usable TRB of a ring segment, the enqueue pointer is advanced to the subsequent link TRB and no further. If the command is later aborted, when the abort completion is handled the dequeue pointer is advanced to the first TRB of the next segment.

If no further commands are queued, xhci_handle_stopped_cmd_ring() sees the ring pointers unequal and assumes that there is a pending command, so it calls xhci_mod_cmd_timer() which crashes if cur_cmd was NULL.

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Don't attempt timer setup if cur_cmd is NULL. The subsequent doorbell ring likely is unnecessary too, but it's harmless. Leave it alone.

This is probably Bug 219532, but no confirmation has been received.

The issue has been independently reproduced and confirmed fixed using a USB MCU programmed to NAK the Status stage of SET_ADDRESS forever. Everything continued working normally after several prevented crashes.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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          "value": "CWE-476"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: xhci: Fix NULL pointer dereference on certain command aborts\n\nIf a command is queued to the final usable TRB of a ring segment, the\nenqueue pointer is advanced to the subsequent link TRB and no further.\nIf the command is later aborted, when the abort completion is handled\nthe dequeue pointer is advanced to the first TRB of the next segment.\n\nIf no further commands are queued, xhci_handle_stopped_cmd_ring() sees\nthe ring pointers unequal and assumes that there is a pending command,\nso it calls xhci_mod_cmd_timer() which crashes if cur_cmd was NULL.\n\nDon't attempt timer setup if cur_cmd is NULL. The subsequent doorbell\nring likely is unnecessary too, but it's harmless. Leave it alone.\n\nThis is probably Bug 219532, but no confirmation has been received.\n\nThe issue has been independently reproduced and confirmed fixed using\na USB MCU programmed to NAK the Status stage of SET_ADDRESS forever.\nEverything continued working normally after several prevented crashes."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: xhci: Fix NULL pointer dereference on certain command aborts Si un comando se pone en cola en el TRB utilizable final de un segmento de anillo, el puntero de encolado avanza al TRB de enlace posterior y no más allá. Si el comando se aborta más tarde, cuando se maneja la finalización del aborto, el puntero de desencolado avanza al primer TRB del siguiente segmento. Si no se ponen en cola más comandos, xhci_handle_stopped_cmd_ring() ve que los punteros de anillo son desiguales y supone que hay un comando pendiente, por lo que llama a xhci_mod_cmd_timer() que se bloquea si cur_cmd era NULL. No intente configurar el temporizador si cur_cmd es NULL. El timbre de puerta posterior probablemente también sea innecesario, pero es inofensivo. Déjelo en paz. Probablemente se trate del error 219532, pero no se ha recibido confirmación. El problema se ha reproducido de forma independiente y se ha confirmado que se ha solucionado utilizando una MCU USB programada para anular la etapa de estado de SET_ADDRESS para siempre. Todo siguió funcionando normalmente después de varios fallos evitados."
    }
  ],
  "lastModified": "2026-06-17T08:14:22.183",
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