CVE-2022-49223

Estado: AnalizadaAlta (7.8)—

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

cxl/port: Hold port reference until decoder release

KASAN + DEBUG_KOBJECT_RELEASE reports a potential use-after-free in cxl_decoder_release() where it goes to reference its parent, a cxl_port, to free its id back to port->decoder_ida.

The device core only guarantees parent lifetime until all children are unregistered. If a child needs a parent to complete its ->release() callback that child needs to hold a reference to extend the lifetime of the parent.

Detalles técnicos trazas, registros y código del informe original

 BUG: KASAN: use-after-free in to_cxl_port+0x18/0x90 [cxl_core]
 Read of size 8 at addr ffff888119270908 by task kworker/35:2/379

 CPU: 35 PID: 379 Comm: kworker/35:2 Tainted: G           OE     5.17.0-rc2+ #198
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
 Workqueue: events kobject_delayed_cleanup
 Call Trace:
  <TASK>
  dump_stack_lvl+0x59/0x73
  print_address_description.constprop.0+0x1f/0x150
  ? to_cxl_port+0x18/0x90 [cxl_core]
  kasan_report.cold+0x83/0xdf
  ? to_cxl_port+0x18/0x90 [cxl_core]
  to_cxl_port+0x18/0x90 [cxl_core]
  cxl_decoder_release+0x2a/0x60 [cxl_core]
  device_release+0x5f/0x100
  kobject_cleanup+0x80/0x1c0

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: 0.27%
Percentil entre todas las CVEs puntuadas: 17
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 escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %

Vulnerabilidad CWE-416 (use-after-free) en kernel de Linux con acceso local y privilegios mínimos (PR:L). El defecto en cxl_decoder_release() permite corrupción de memoria que podría llevar a ejecución de código arbitrario.

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

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/port: Hold port reference until decoder release\n\nKASAN + DEBUG_KOBJECT_RELEASE reports a potential use-after-free in\ncxl_decoder_release() where it goes to reference its parent, a cxl_port,\nto free its id back to port->decoder_ida.\n\n BUG: KASAN: use-after-free in to_cxl_port+0x18/0x90 [cxl_core]\n Read of size 8 at addr ffff888119270908 by task kworker/35:2/379\n\n CPU: 35 PID: 379 Comm: kworker/35:2 Tainted: G           OE     5.17.0-rc2+ #198\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n Workqueue: events kobject_delayed_cleanup\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x59/0x73\n  print_address_description.constprop.0+0x1f/0x150\n  ? to_cxl_port+0x18/0x90 [cxl_core]\n  kasan_report.cold+0x83/0xdf\n  ? to_cxl_port+0x18/0x90 [cxl_core]\n  to_cxl_port+0x18/0x90 [cxl_core]\n  cxl_decoder_release+0x2a/0x60 [cxl_core]\n  device_release+0x5f/0x100\n  kobject_cleanup+0x80/0x1c0\n\nThe device core only guarantees parent lifetime until all children are\nunregistered. If a child needs a parent to complete its ->release()\ncallback that child needs to hold a reference to extend the lifetime of\nthe parent."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cxl/port: Mantener la referencia del puerto hasta la liberación del decodificador KASAN + DEBUG_KOBJECT_RELEASE informa un posible use-after-free en cxl_decoder_release() donde va a referenciar a su padre, un cxl_port, para liberar su id a port-&gt;decoder_ida. ERROR: KASAN: use-after-free en to_cxl_port+0x18/0x90 [cxl_core] Lectura de tamaño 8 en la dirección ffff888119270908 por la tarea kworker/35:2/379 CPU: 35 PID: 379 Comm: kworker/35:2 Contaminado: G OE 5.17.0-rc2+ #198 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Cola de trabajo: eventos kobject_delayed_cleanup Rastreo de llamadas:  dump_stack_lvl+0x59/0x73 print_address_description.constprop.0+0x1f/0x150 ? to_cxl_port+0x18/0x90 [cxl_core] kasan_report.cold+0x83/0xdf ? to_cxl_port+0x18/0x90 [cxl_core] to_cxl_port+0x18/0x90 [cxl_core] cxl_decoder_release+0x2a/0x60 [cxl_core] device_release+0x5f/0x100 kobject_cleanup+0x80/0x1c0 El núcleo del dispositivo solo garantiza la duración del elemento primario hasta que se anule el registro de todos los elementos secundarios. Si un elemento secundario necesita un elemento primario para completar su devolución de llamada -&gt;release(), ese elemento secundario debe contener una referencia para extender la duración del elemento primario."
    }
  ],
  "lastModified": "2026-06-17T05:17:25.977",
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