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CVE-2026-23440

Estado: ModificadaMedia (4.7)—

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

net/mlx5e: Fix race condition during IPSec ESN update

In IPSec full offload mode, the device reports an ESN (Extended Sequence Number) wrap event to the driver. The driver validates this event by querying the IPSec ASO and checking that the esn_event_arm field is 0x0, which indicates an event has occurred. After handling the event, the driver must re-arm the context by setting esn_event_arm back to 0x1.

A race condition exists in this handling path. After validating the event, the driver calls mlx5_accel_esp_modify_xfrm() to update the kernel's xfrm state. This function temporarily releases and re-acquires the xfrm state lock.

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So, need to acknowledge the event first by setting esn_event_arm to 0x1. This prevents the driver from reprocessing the same ESN update if the hardware sends events for other reason. Since the next ESN update only occurs after nearly 2^31 packets are received, there's no risk of missing an update, as it will happen long after this handling has finished.

Processing the event twice causes the ESN high-order bits (esn_msb) to be incremented incorrectly. The driver then programs the hardware with this invalid ESN state, which leads to anti-replay failures and a complete halt of IPSec traffic.

Fix this by re-arming the ESN event immediately after it is validated, before calling mlx5_accel_esp_modify_xfrm(). This ensures that any spurious, duplicate events are correctly ignored, closing the race window.

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix race condition during IPSec ESN update\n\nIn IPSec full offload mode, the device reports an ESN (Extended\nSequence Number) wrap event to the driver. The driver validates this\nevent by querying the IPSec ASO and checking that the esn_event_arm\nfield is 0x0, which indicates an event has occurred. After handling\nthe event, the driver must re-arm the context by setting esn_event_arm\nback to 0x1.\n\nA race condition exists in this handling path. After validating the\nevent, the driver calls mlx5_accel_esp_modify_xfrm() to update the\nkernel's xfrm state. This function temporarily releases and\nre-acquires the xfrm state lock.\n\nSo, need to acknowledge the event first by setting esn_event_arm to\n0x1. This prevents the driver from reprocessing the same ESN update if\nthe hardware sends events for other reason. Since the next ESN update\nonly occurs after nearly 2^31 packets are received, there's no risk of\nmissing an update, as it will happen long after this handling has\nfinished.\n\nProcessing the event twice causes the ESN high-order bits (esn_msb) to\nbe incremented incorrectly. The driver then programs the hardware with\nthis invalid ESN state, which leads to anti-replay failures and a\ncomplete halt of IPSec traffic.\n\nFix this by re-arming the ESN event immediately after it is validated,\nbefore calling mlx5_accel_esp_modify_xfrm(). This ensures that any\nspurious, duplicate events are correctly ignored, closing the race\nwindow."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/mlx5e: Corrige condición de carrera durante la actualización de ESN de IPSec\n\nEn modo de descarga completa de IPSec, el dispositivo informa un evento de envoltura de ESN (Número de Secuencia Extendido) al controlador. El controlador valida este evento consultando el ASO de IPSec y verificando que el campo esn_event_arm sea 0x0, lo que indica que ha ocurrido un evento. Después de manejar el evento, el controlador debe rearmar el contexto estableciendo esn_event_arm de nuevo a 0x1.\n\nExiste una condición de carrera en esta ruta de manejo. Después de validar el evento, el controlador llama a mlx5_accel_esp_modify_xfrm() para actualizar el estado xfrm del kernel. Esta función libera temporalmente y vuelve a adquirir el bloqueo de estado xfrm.\n\nPor lo tanto, es necesario reconocer el evento primero estableciendo esn_event_arm en 0x1. Esto evita que el controlador reprocese la misma actualización de ESN si el hardware envía eventos por otra razón. Dado que la próxima actualización de ESN solo ocurre después de que se reciben casi 2^31 paquetes, no hay riesgo de perder una actualización, ya que ocurrirá mucho después de que este manejo haya terminado.\n\nProcesar el evento dos veces hace que los bits de orden superior de ESN (esn_msb) se incrementen incorrectamente. El controlador luego programa el hardware con este estado ESN inválido, lo que lleva a fallos de anti-replay y una detención completa del tráfico IPSec.\n\nSolucione esto rearmando el evento ESN inmediatamente después de que sea validado, antes de llamar a mlx5_accel_esp_modify_xfrm(). Esto asegura que cualquier evento espurio o duplicado sea correctamente ignorado, cerrando la ventana de carrera."
    }
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  "lastModified": "2026-07-24T21:10:00.143",
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