CVE-2022-50229
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
ALSA: bcd2000: Fix a UAF bug on the error path of probing
When the driver fails in snd_card_register() at probe time, it will free the 'bcd2k->midi_out_urb' before killing it, which may cause a UAF bug.
The following log can reveal it:
Fix this by adding usb_kill_urb() before usb_free_urb().
Detalles técnicos trazas, registros y código del informe original
[ 50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000] [ 50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0 [ 50.729530] Call Trace: [ 50.732899] bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]
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: 0.24%
- Percentil entre todas las CVEs puntuadas: 14
- Fecha de la puntuación: 5/10/2026
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.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact65 %
CVE local (AV:L PR:L) con UAF (CWE-416) en driver ALSA que causa crash/DoS; T1068 por escalada potencial vía kernel, T1499.004 (aplicación) por negación de servicio.
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
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/05e0bb8c3c4dde3e21b9c1cf9395afb04e8b24db
- https://git.kernel.org/stable/c/1d6a246cf97c380f2da76591f03019dd9c9599c3
- https://git.kernel.org/stable/c/348620464a5c127399ac09b266f494f393661952
- https://git.kernel.org/stable/c/4fc41f7ebb7efca282f1740ea934d16f33c1d109
- https://git.kernel.org/stable/c/5e7338f4dd92b2f8915a82abfa1dd3ad3464bea0
- https://git.kernel.org/stable/c/64ca7f50ad96c2c65ae390b954925a36eabe04aa
- https://git.kernel.org/stable/c/a718eba7e458e2f40531be3c6b6a0028ca7fcace
- https://git.kernel.org/stable/c/b0d4af0a4763ddc02344789ef2a281c494bc330d
- https://git.kernel.org/stable/c/ffb2759df7efbc00187bfd9d1072434a13a54139
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: bcd2000: Fix a UAF bug on the error path of probing\n\nWhen the driver fails in snd_card_register() at probe time, it will free\nthe 'bcd2k->midi_out_urb' before killing it, which may cause a UAF bug.\n\nThe following log can reveal it:\n\n[ 50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]\n[ 50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0\n[ 50.729530] Call Trace:\n[ 50.732899] bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]\n\nFix this by adding usb_kill_urb() before usb_free_urb()."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: bcd2000: corrige un error de UAF en la ruta de error del sondeo Cuando el controlador falla en snd_card_register() en el momento del sondeo, liberará 'bcd2k->midi_out_urb' antes de matarlo, lo que puede causar un error de UAF. El siguiente registro puede revelarlo: [ 50.727020] ERROR: KASAN: uso después de la liberación en bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000] [ 50.727623] Lectura de tamaño 8 en la dirección ffff88810fab0e88 por el intercambiador de tareas/4/0 [ 50.729530] Seguimiento de llamadas: [ 50.732899] bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000] Solucione esto agregando usb_kill_urb() antes de usb_free_urb()."
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