CVE-2026-23184

Estado: ModificadaAlta (7.8)—

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

binder: fix UAF in binder_netlink_report()

Oneway transactions sent to frozen targets via binder_proc_transaction() return a BR_TRANSACTION_PENDING_FROZEN error but they are still treated as successful since the target is expected to thaw at some point. It is then not safe to access 't' after BR_TRANSACTION_PENDING_FROZEN errors as the transaction could have been consumed by the now thawed target.

This is the case for binder_netlink_report() which derreferences 't' after a pending frozen error, as pointed out by the following KASAN report:

Leer descripción completaMostrar menos

Instead, make a transaction copy so the data can be safely accessed by binder_netlink_report() after a pending frozen error. While here, add a comment about not using t->buffer in binder_netlink_report().

Detalles técnicos trazas, registros y código del informe original

  ==================================================================
  BUG: KASAN: slab-use-after-free in binder_netlink_report.isra.0+0x694/0x6c8
  Read of size 8 at addr ffff00000f98ba38 by task binder-util/522

  CPU: 4 UID: 0 PID: 522 Comm: binder-util Not tainted 6.19.0-rc6-00015-gc03e9c42ae8f #1 PREEMPT
  Hardware name: linux,dummy-virt (DT)
  Call trace:
   binder_netlink_report.isra.0+0x694/0x6c8
   binder_transaction+0x66e4/0x79b8
   binder_thread_write+0xab4/0x4440
   binder_ioctl+0x1fd4/0x2940
   [...]

  Allocated by task 522:
   __kmalloc_cache_noprof+0x17c/0x50c
   binder_transaction+0x584/0x79b8
   binder_thread_write+0xab4/0x4440
   binder_ioctl+0x1fd4/0x2940
   [...]

  Freed by task 488:
   kfree+0x1d0/0x420
   binder_free_transaction+0x150/0x234
   binder_thread_read+0x2d08/0x3ce4
   binder_ioctl+0x488/0x2940
   [...]
  ==================================================================

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: 0.13%
Percentil entre todas las CVEs puntuadas: 2
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).

🎯 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 escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Use-after-free (CWE-416) en kernel local que permite lectura/escritura de memoria del proceso binder, potencialmente escalando privilegios o ejecutando código arbitrario con permisos elevados.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-23184",
  "cveTags": [],
  "metrics": {
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_netlink_report()\n\nOneway transactions sent to frozen targets via binder_proc_transaction()\nreturn a BR_TRANSACTION_PENDING_FROZEN error but they are still treated\nas successful since the target is expected to thaw at some point. It is\nthen not safe to access 't' after BR_TRANSACTION_PENDING_FROZEN errors\nas the transaction could have been consumed by the now thawed target.\n\nThis is the case for binder_netlink_report() which derreferences 't'\nafter a pending frozen error, as pointed out by the following KASAN\nreport:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in binder_netlink_report.isra.0+0x694/0x6c8\n  Read of size 8 at addr ffff00000f98ba38 by task binder-util/522\n\n  CPU: 4 UID: 0 PID: 522 Comm: binder-util Not tainted 6.19.0-rc6-00015-gc03e9c42ae8f #1 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   binder_netlink_report.isra.0+0x694/0x6c8\n   binder_transaction+0x66e4/0x79b8\n   binder_thread_write+0xab4/0x4440\n   binder_ioctl+0x1fd4/0x2940\n   [...]\n\n  Allocated by task 522:\n   __kmalloc_cache_noprof+0x17c/0x50c\n   binder_transaction+0x584/0x79b8\n   binder_thread_write+0xab4/0x4440\n   binder_ioctl+0x1fd4/0x2940\n   [...]\n\n  Freed by task 488:\n   kfree+0x1d0/0x420\n   binder_free_transaction+0x150/0x234\n   binder_thread_read+0x2d08/0x3ce4\n   binder_ioctl+0x488/0x2940\n   [...]\n  ==================================================================\n\nInstead, make a transaction copy so the data can be safely accessed by\nbinder_netlink_report() after a pending frozen error. While here, add a\ncomment about not using t->buffer in binder_netlink_report()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbinder: corregir UAF en binder_netlink_report()\n\nLas transacciones unidireccionales enviadas a objetivos congelados a través de binder_proc_transaction() devuelven un error BR_TRANSACTION_PENDING_FROZEN pero aún se tratan como exitosas ya que se espera que el objetivo se descongele en algún momento. Por lo tanto, no es seguro acceder a 't' después de errores BR_TRANSACTION_PENDING_FROZEN, ya que la transacción podría haber sido consumida por el objetivo ahora descongelado.\n\nEste es el caso de binder_netlink_report() que desreferencia 't' después de un error de congelación pendiente, como lo señala el siguiente informe KASAN:\n\n  ==================================================================\n  ERROR: KASAN: uso después de liberación de slab en binder_netlink_report.isra.0+0x694/0x6c8\n  Lectura de tamaño 8 en la dirección ffff00000f98ba38 por la tarea binder-util/522\n\n  CPU: 4 UID: 0 PID: 522 Comm: binder-util No contaminado 6.19.0-rc6-00015-gc03e9c42ae8f #1 PREEMPT\n  Nombre del hardware: linux,dummy-virt (DT)\n  Rastro de llamada:\n   binder_netlink_report.isra.0+0x694/0x6c8\n   binder_transaction+0x66e4/0x79b8\n   binder_thread_write+0xab4/0x4440\n   binder_ioctl+0x1fd4/0x2940\n   [...]\n\n  Asignado por la tarea 522:\n   __kmalloc_cache_noprof+0x17c/0x50c\n   binder_transaction+0x584/0x79b8\n   binder_thread_write+0xab4/0x4440\n   binder_ioctl+0x1fd4/0x2940\n   [...]\n\n  Liberado por la tarea 488:\n   kfree+0x1d0/0x420\n   binder_free_transaction+0x150/0x234\n   binder_thread_read+0x2d08/0x3ce4\n   binder_ioctl+0x488/0x2940\n   [...]\n  ==================================================================\n\nEn su lugar, haga una copia de la transacción para que los datos puedan ser accedidos de forma segura por binder_netlink_report() después de un error de congelación pendiente. Ya que estamos, añada un comentario sobre no usar t-&gt;buffer en binder_netlink_report()."
    }
  ],
  "lastModified": "2026-06-17T10:21:03.340",
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