CVE-2024-53237

Estado: ModificadaAlta (7.8)—

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

Bluetooth: fix use-after-free in device_for_each_child()

Syzbot has reported the following KASAN splat:

In 'hci_conn_del_sysfs()', 'device_unregister()' may be called when an underlying (kobject) reference counter is greater than 1. This means that reparenting (happened when the device is actually freed) is delayed and, during that delay, parent controller device (hciX) may be deleted. Since the latter may create a dangling pointer to freed parent, avoid that scenario by reparenting to NULL explicitly.

Detalles técnicos trazas, registros y código del informe original

BUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0
Read of size 8 at addr ffff88801f605308 by task kbnepd bnep0/4980

CPU: 0 UID: 0 PID: 4980 Comm: kbnepd bnep0 Not tainted 6.12.0-rc4-00161-gae90f6a6170d #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x100/0x190
 ? device_for_each_child+0x18f/0x1a0
 print_report+0x13a/0x4cb
 ? __virt_addr_valid+0x5e/0x590
 ? __phys_addr+0xc6/0x150
 ? device_for_each_child+0x18f/0x1a0
 kasan_report+0xda/0x110
 ? device_for_each_child+0x18f/0x1a0
 ? __pfx_dev_memalloc_noio+0x10/0x10
 device_for_each_child+0x18f/0x1a0
 ? __pfx_device_for_each_child+0x10/0x10
 pm_runtime_set_memalloc_noio+0xf2/0x180
 netdev_unregister_kobject+0x1ed/0x270
 unregister_netdevice_many_notify+0x123c/0x1d80
 ? __mutex_trylock_common+0xde/0x250
 ? __pfx_unregister_netdevice_many_notify+0x10/0x10
 ? trace_contention_end+0xe6/0x140
 ? __mutex_lock+0x4e7/0x8f0
 ? __pfx_lock_acquire.part.0+0x10/0x10
 ? rcu_is_watching+0x12/0xc0
 ? unregister_netdev+0x12/0x30
 unregister_netdevice_queue+0x30d/0x3f0
 ? __pfx_unregister_netdevice_queue+0x10/0x10
 ? __pfx_down_write+0x10/0x10
 unregister_netdev+0x1c/0x30
 bnep_session+0x1fb3/0x2ab0
 ? __pfx_bnep_session+0x10/0x10
 ? __pfx_lock_release+0x10/0x10
 ? __pfx_woken_wake_function+0x10/0x10
 ? __kthread_parkme+0x132/0x200
 ? __pfx_bnep_session+0x10/0x10
 ? kthread+0x13a/0x370
 ? __pfx_bnep_session+0x10/0x10
 kthread+0x2b7/0x370
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x48/0x80
 ? __pfx_kthread+0x10/0x10
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 4974:
 kasan_save_stack+0x30/0x50
 kasan_save_track+0x14/0x30
 __kasan_kmalloc+0xaa/0xb0
 __kmalloc_noprof+0x1d1/0x440
 hci_alloc_dev_priv+0x1d/0x2820
 __vhci_create_device+0xef/0x7d0
 vhci_write+0x2c7/0x480
 vfs_write+0x6a0/0xfc0
 ksys_write+0x12f/0x260
 do_syscall_64+0xc7/0x250
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 4979:
 kasan_save_stack+0x30/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3b/0x60
 __kasan_slab_free+0x4f/0x70
 kfree+0x141/0x490
 hci_release_dev+0x4d9/0x600
 bt_host_release+0x6a/0xb0
 device_release+0xa4/0x240
 kobject_put+0x1ec/0x5a0
 put_device+0x1f/0x30
 vhci_release+0x81/0xf0
 __fput+0x3f6/0xb30
 task_work_run+0x151/0x250
 do_exit+0xa79/0x2c30
 do_group_exit+0xd5/0x2a0
 get_signal+0x1fcd/0x2210
 arch_do_signal_or_restart+0x93/0x780
 syscall_exit_to_user_mode+0x140/0x290
 do_syscall_64+0xd4/0x250
 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: 0.32%
Percentil entre todas las CVEs puntuadas: 23
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 principalT1499.004 Application or System Exploitationimpact70 %

Vulnerabilidad local (AV:L/PR:L) con uso after-free que causa DoS al kernel Bluetooth; escalada de privilegios posible por corrupción de memoria accesible desde proceso no privilegiado.

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

CWE-416
CWE-416

Referencias

JSON original (NVD)

Mostrar

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            {
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            {
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              "version": "5.15.140",
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            {
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              "version": "4.19.300",
              "lessThan": "4.20",
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              "lessThan": "6.6",
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          ],
          "programFiles": [
            "net/bluetooth/hci_sysfs.c"
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              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/hci_sysfs.c"
          ],
          "defaultStatus": "affected"
        }
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    }
  ],
  "published": "2024-12-27T14:15:32.130",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0f67ca2a80acf8b207240405b7f72d660665d3df",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/27aabf27fd014ae037cc179c61b0bee7cff55b3d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6894717a1ea363c5a27010ba604f957c309d282d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7b277bd569bb6a2777f0014f84b4344f444fd49d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/91e2a2e4d1336333804cd31162984f01ad8cc70f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a9584c897d1cba6265c78010bbb45ca5722c88bc",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/de5a44f351ca7efd9add9851b218f5353e2224b7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fb91ce37dc9a37ea23cf32b6d7b667004e93d4c5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix use-after-free in device_for_each_child()\n\nSyzbot has reported the following KASAN splat:\n\nBUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0\nRead of size 8 at addr ffff88801f605308 by task kbnepd bnep0/4980\n\nCPU: 0 UID: 0 PID: 4980 Comm: kbnepd bnep0 Not tainted 6.12.0-rc4-00161-gae90f6a6170d #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014\nCall Trace:\n <TASK>\n dump_stack_lvl+0x100/0x190\n ? device_for_each_child+0x18f/0x1a0\n print_report+0x13a/0x4cb\n ? __virt_addr_valid+0x5e/0x590\n ? __phys_addr+0xc6/0x150\n ? device_for_each_child+0x18f/0x1a0\n kasan_report+0xda/0x110\n ? device_for_each_child+0x18f/0x1a0\n ? __pfx_dev_memalloc_noio+0x10/0x10\n device_for_each_child+0x18f/0x1a0\n ? __pfx_device_for_each_child+0x10/0x10\n pm_runtime_set_memalloc_noio+0xf2/0x180\n netdev_unregister_kobject+0x1ed/0x270\n unregister_netdevice_many_notify+0x123c/0x1d80\n ? __mutex_trylock_common+0xde/0x250\n ? __pfx_unregister_netdevice_many_notify+0x10/0x10\n ? trace_contention_end+0xe6/0x140\n ? __mutex_lock+0x4e7/0x8f0\n ? __pfx_lock_acquire.part.0+0x10/0x10\n ? rcu_is_watching+0x12/0xc0\n ? unregister_netdev+0x12/0x30\n unregister_netdevice_queue+0x30d/0x3f0\n ? __pfx_unregister_netdevice_queue+0x10/0x10\n ? __pfx_down_write+0x10/0x10\n unregister_netdev+0x1c/0x30\n bnep_session+0x1fb3/0x2ab0\n ? __pfx_bnep_session+0x10/0x10\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_woken_wake_function+0x10/0x10\n ? __kthread_parkme+0x132/0x200\n ? __pfx_bnep_session+0x10/0x10\n ? kthread+0x13a/0x370\n ? __pfx_bnep_session+0x10/0x10\n kthread+0x2b7/0x370\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x48/0x80\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nAllocated by task 4974:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n __kmalloc_noprof+0x1d1/0x440\n hci_alloc_dev_priv+0x1d/0x2820\n __vhci_create_device+0xef/0x7d0\n vhci_write+0x2c7/0x480\n vfs_write+0x6a0/0xfc0\n ksys_write+0x12f/0x260\n do_syscall_64+0xc7/0x250\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 4979:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x4f/0x70\n kfree+0x141/0x490\n hci_release_dev+0x4d9/0x600\n bt_host_release+0x6a/0xb0\n device_release+0xa4/0x240\n kobject_put+0x1ec/0x5a0\n put_device+0x1f/0x30\n vhci_release+0x81/0xf0\n __fput+0x3f6/0xb30\n task_work_run+0x151/0x250\n do_exit+0xa79/0x2c30\n do_group_exit+0xd5/0x2a0\n get_signal+0x1fcd/0x2210\n arch_do_signal_or_restart+0x93/0x780\n syscall_exit_to_user_mode+0x140/0x290\n do_syscall_64+0xd4/0x250\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nIn 'hci_conn_del_sysfs()', 'device_unregister()' may be called when\nan underlying (kobject) reference counter is greater than 1. This\nmeans that reparenting (happened when the device is actually freed)\nis delayed and, during that delay, parent controller device (hciX)\nmay be deleted. Since the latter may create a dangling pointer to\nfreed parent, avoid that scenario by reparenting to NULL explicitly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: corrección de use-after-free en device_for_each_child() Syzbot ha informado del siguiente splat de KASAN: ERROR: KASAN: slab-use-after-free en device_for_each_child+0x18f/0x1a0 Lectura de tamaño 8 en la dirección ffff88801f605308 por la tarea kbnepd bnep0/4980 CPU: 0 UID: 0 PID: 4980 Comm: kbnepd bnep0 No contaminado 6.12.0-rc4-00161-gae90f6a6170d #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014 Rastreo de llamadas:  dump_stack_lvl+0x100/0x190 ? dispositivo_para_cada_hijo+0x18f/0x1a0 imprimir_informe+0x13a/0x4cb ? __virt_addr_valid+0x5e/0x590 ? __phys_addr+0xc6/0x150 ? dispositivo_para_cada_hijo+0x18f/0x1a0 kasan_informe+0xda/0x110 ? dispositivo_para_cada_hijo+0x18f/0x1a0 ? __pfx_dev_memalloc_noio+0x10/0x10 dispositivo_para_cada_hijo+0x18f/0x1a0 ? __pfx_device_for_each_child+0x10/0x10 pm_runtime_set_memalloc_noio+0xf2/0x180 netdev_unregister_kobject+0x1ed/0x270 anular_registro_de_dispositivo_de_red_muchas_notificaciones+0x123c/0x1d80 ? __mutex_trylock_common+0xde/0x250 ? __pfx_unregister_netdevice_muchas_notificaciones+0x10/0x10 ? trace_contention_end+0xe6/0x140 ? __mutex_lock+0x4e7/0x8f0 ? __pfx_lock_acquire.part.0+0x10/0x10 ? rcu_is_watching+0x12/0xc0 ? anular el registro de_netdev+0x12/0x30 anular el registro de_netdevice_queue+0x30d/0x3f0 ? __pfx_anular el registro de_netdevice_queue+0x10/0x10 ? __pfx_down_write+0x10/0x10 anular el registro de_netdev+0x1c/0x30 bnep_session+0x1fb3/0x2ab0 ? __pfx_bnep_session+0x10/0x10 ? __pfx_lock_release+0x10/0x10 ? __pfx_woken_wake_function+0x10/0x10 ? __kthread_parkme+0x132/0x200 ? __pfx_bnep_session+0x10/0x10 ? kthread+0x13a/0x370 ? __pfx_bnep_session+0x10/0x10 kthread+0x2b7/0x370 ? __pfx_kthread+0x10/0x10 ret_de_la_bifurcación+0x48/0x80 ? Asignado por la tarea 4974: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 __kmalloc_noprof+0x1d1/0x440 hci_alloc_dev_priv+0x1d/0x2820 __vhci_create_device+0xef/0x7d0 vhci_write+0x2c7/0x480 vfs_write+0x6a0/0xfc0 ksys_write+0x12f/0x260 do_syscall_64+0xc7/0x250 entrada_SYSCALL_64_after_hwframe+0x77/0x7f Liberado por la tarea 4979: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x4f/0x70 kfree+0x141/0x490 hci_release_dev+0x4d9/0x600 bt_host_release+0x6a/0xb0 device_release+0xa4/0x240 kobject_put+0x1ec/0x5a0 put_device+0x1f/0x30 vhci_release+0x81/0xf0 __fput+0x3f6/0xb30 En 'hci_conn_del_sysfs()', se puede llamar a 'device_unregister()' cuando un contador de referencia subyacente (kobject) es mayor que 1. Esto significa que la re-asignación de padres (que ocurre cuando el dispositivo se libera realmente) se demora y, durante esa demora, se puede eliminar el dispositivo controlador principal (hciX). Dado que esto último puede crear un puntero colgante al padre liberado, evite ese escenario cambiando el padre a NULL explícitamente. "
    }
  ],
  "lastModified": "2026-08-04T11:22:07.617",
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