CVE-2025-37949

Estado: ModificadaMedia (5.5)—

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

xenbus: Use kref to track req lifetime

process_msg+0x18e is req->cb(req). req->cb is set to xs_wake_up(), a thin wrapper around wake_up(), or xenbus_dev_queue_reply(). It seems like it was xs_wake_up() in this case.

It seems like req may have woken up the xs_wait_for_reply(), which kfree()ed the req. When xenbus_thread resumes, it faults on the zero-ed data.

Linux Device Drivers 2nd edition states: "Normally, a wake_up call can cause an immediate reschedule to happen, meaning that other processes might run before wake_up returns." ... which would match the behaviour observed.

Leer descripción completaMostrar menos

Change to keeping two krefs on each request. One for the caller, and one for xenbus_thread. Each will kref_put() when finished, and the last will free it.

This use of kref matches the description in Documentation/core-api/kref.rst

Detalles técnicos trazas, registros y código del informe original

Marek reported seeing a NULL pointer fault in the xenbus_thread
callstack:
BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: e030:__wake_up_common+0x4c/0x180
Call Trace:
 <TASK>
 __wake_up_common_lock+0x82/0xd0
 process_msg+0x18e/0x2f0
 xenbus_thread+0x165/0x1c0

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.23%
Percentil entre todas las CVEs puntuadas: 13
Fecha de la puntuación: 6/10/2026

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).

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxenbus: Use kref to track req lifetime\n\nMarek reported seeing a NULL pointer fault in the xenbus_thread\ncallstack:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nRIP: e030:__wake_up_common+0x4c/0x180\nCall Trace:\n <TASK>\n __wake_up_common_lock+0x82/0xd0\n process_msg+0x18e/0x2f0\n xenbus_thread+0x165/0x1c0\n\nprocess_msg+0x18e is req->cb(req).  req->cb is set to xs_wake_up(), a\nthin wrapper around wake_up(), or xenbus_dev_queue_reply().  It seems\nlike it was xs_wake_up() in this case.\n\nIt seems like req may have woken up the xs_wait_for_reply(), which\nkfree()ed the req.  When xenbus_thread resumes, it faults on the zero-ed\ndata.\n\nLinux Device Drivers 2nd edition states:\n\"Normally, a wake_up call can cause an immediate reschedule to happen,\nmeaning that other processes might run before wake_up returns.\"\n... which would match the behaviour observed.\n\nChange to keeping two krefs on each request.  One for the caller, and\none for xenbus_thread.  Each will kref_put() when finished, and the last\nwill free it.\n\nThis use of kref matches the description in\nDocumentation/core-api/kref.rst"
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    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xenbus: Usar kref para rastrear el tiempo de vida de req. Marek informó haber visto un fallo de puntero nulo en la pila de llamadas xenbus_thread: ERROR: desreferencia de puntero nulo del kernel, dirección: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Rastreo de llamadas:  __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e es req-&gt;cb(req). req-&gt;cb está configurado como xs_wake_up(), una envoltura ligera alrededor de wake_up(), o xenbus_dev_queue_reply(). Parece que en este caso era xs_wake_up(). Parece que req pudo haber despertado xs_wait_for_reply(), que liberó la solicitud. Cuando xenbus_thread se reanuda, falla en los datos con ceros. La segunda edición de los controladores de dispositivos de Linux indica: «Normalmente, una llamada wake_up puede provocar una reprogramación inmediata, lo que significa que otros procesos podrían ejecutarse antes de que wake_up regrese». ... lo cual coincidiría con el comportamiento observado. Se recomienda mantener dos krefs en cada solicitud: uno para el que realiza la llamada y otro para xenbus_thread. Cada uno ejecutará kref_put() al finalizar, y el último lo liberará. Este uso de kref coincide con la descripción en Documentation/core-api/kref.rst."
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