CVE-2025-71082

Estado: ModificadaAlta (7.8)—

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

Bluetooth: btusb: revert use of devm_kzalloc in btusb

This reverts commit 98921dbd00c4e ("Bluetooth: Use devm_kzalloc in btusb.c file").

In btusb_probe(), we use devm_kzalloc() to allocate the btusb data. This ties the lifetime of all the btusb data to the binding of a driver to one interface, INTF. In a driver that binds to other interfaces, ISOC and DIAG, this is an accident waiting to happen.

The issue is revealed in btusb_disconnect(), where calling usb_driver_release_interface(&btusb_driver, data->intf) will have devm free the data that is also being used by the other interfaces of the driver that may not be released yet.

Leer descripción completaMostrar menos

To fix this, revert the use of devm and go back to freeing memory explicitly.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.14%
Percentil entre todas las CVEs puntuadas: 3
Fecha de la puntuación: 4/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact65 %
Impacto secundarioT1561.002 Disk Structure Wipeimpact60 %

Vulnerabilidad de uso después de liberación (use-after-free) en btusb del kernel Linux con acceso local y privilegios limitados (PR:L), permitiendo escalada de privilegios o denegación de servicio. Vector CVSS AV:L/PR:L/UI:N con impacto alto en confidencialidad, integridad y disponibilidad.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: revert use of devm_kzalloc in btusb\n\nThis reverts commit 98921dbd00c4e (\"Bluetooth: Use devm_kzalloc in\nbtusb.c file\").\n\nIn btusb_probe(), we use devm_kzalloc() to allocate the btusb data. This\nties the lifetime of all the btusb data to the binding of a driver to\none interface, INTF. In a driver that binds to other interfaces, ISOC\nand DIAG, this is an accident waiting to happen.\n\nThe issue is revealed in btusb_disconnect(), where calling\nusb_driver_release_interface(&btusb_driver, data->intf) will have devm\nfree the data that is also being used by the other interfaces of the\ndriver that may not be released yet.\n\nTo fix this, revert the use of devm and go back to freeing memory\nexplicitly."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: btusb: revertir el uso de devm_kzalloc en btusb\n\nEsto revierte el commit 98921dbd00c4e ('Bluetooth: Usar devm_kzalloc en el archivo btusb.c').\n\nEn btusb_probe(), usamos devm_kzalloc() para asignar los datos de btusb. Esto vincula la vida útil de todos los datos de btusb a la vinculación de un controlador a una interfaz, INTF. En un controlador que se vincula a otras interfaces, ISOC y DIAG, esto es un accidente a punto de ocurrir.\n\nEl problema se revela en btusb_disconnect(), donde llamar a usb_driver_release_interface(&amp;btusb_driver, data-&gt;intf) hará que devm libere los datos que también están siendo utilizados por las otras interfaces del controlador que quizás aún no se hayan liberado.\n\nPara solucionar esto, se revierte el uso de devm y se vuelve a liberar la memoria explícitamente."
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