CVE-2026-53024

Estado: AnalizadaAlta (7.8)—

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

greybus: raw: fix use-after-free if write is called after disconnect

If a user writes to the chardev after disconnect has been called, the kernel panics with the following trace (with CONFIG_INIT_ON_FREE_DEFAULT_ON=y):

Disconnect calls gb_connection_destroy, which ends up freeing the connection object. When gb_operation_sync is called in the write file operations, its gets a freed connection as parameter and the kernel panics.

The gb_connection_destroy cannot be moved out of the disconnect function, as the Greybus subsystem expect all connections belonging to a bundle to be destroyed when disconnect returns.

Leer descripción completaMostrar menos

To prevent this bug, use a rw lock to synchronize access between write and disconnect. This guarantees that the write function doesn't try to use a disconnected connection.

Detalles técnicos trazas, registros y código del informe original

        BUG: kernel NULL pointer dereference, address: 0000000000000218
         ...
        Call Trace:
         <TASK>
         gb_operation_create_common+0x61/0x180
         gb_operation_create_flags+0x28/0xa0
         gb_operation_sync_timeout+0x6f/0x100
         raw_write+0x7b/0xc7 [gb_raw]
         vfs_write+0xcf/0x420
         ? task_mm_cid_work+0x136/0x220
         ksys_write+0x63/0xe0
         do_syscall_64+0xa4/0x290
         entry_SYSCALL_64_after_hwframe+0x77/0x7f

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: 0.17%
Percentil entre todas las CVEs puntuadas: 5
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 %

CWE-416 (use-after-free) con AV:L/PR:L permite escalada local de privilegios. El pánico kernel sugiere ejecución de código arbitrario mediante escritura a chardev tras desconexión.

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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        "type": "Secondary",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngreybus: raw: fix use-after-free if write is called after disconnect\n\nIf a user writes to the chardev after disconnect has been called, the\nkernel panics with the following trace (with\nCONFIG_INIT_ON_FREE_DEFAULT_ON=y):\n\n        BUG: kernel NULL pointer dereference, address: 0000000000000218\n         ...\n        Call Trace:\n         <TASK>\n         gb_operation_create_common+0x61/0x180\n         gb_operation_create_flags+0x28/0xa0\n         gb_operation_sync_timeout+0x6f/0x100\n         raw_write+0x7b/0xc7 [gb_raw]\n         vfs_write+0xcf/0x420\n         ? task_mm_cid_work+0x136/0x220\n         ksys_write+0x63/0xe0\n         do_syscall_64+0xa4/0x290\n         entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nDisconnect calls gb_connection_destroy, which ends up freeing the\nconnection object. When gb_operation_sync is called in the write file\noperations, its gets a freed connection as parameter and the kernel\npanics.\n\nThe gb_connection_destroy cannot be moved out of the disconnect\nfunction, as the Greybus subsystem expect all connections belonging to a\nbundle to be destroyed when disconnect returns.\n\nTo prevent this bug, use a rw lock to synchronize access between write\nand disconnect. This guarantees that the write function doesn't try\nto use a disconnected connection."
    }
  ],
  "lastModified": "2026-07-15T13:56:25.090",
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