CVE-2026-31581
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
ALSA: 6fire: fix use-after-free on disconnect
In usb6fire_chip_abort(), the chip struct is allocated as the card's private data (via snd_card_new with sizeof(struct sfire_chip)). When snd_card_free_when_closed() is called and no file handles are open, the card and embedded chip are freed synchronously. The subsequent chip->card = NULL write then hits freed slab memory.
Fix by moving the card lifecycle out of usb6fire_chip_abort() and into usb6fire_chip_disconnect().
Leer descripción completaMostrar menos
The card pointer is saved in a local before any teardown, snd_card_disconnect() is called first to prevent new opens, URBs are aborted while chip is still valid, and snd_card_free_when_closed() is called last so chip is never accessed after the card may be freed.
Detalles técnicos trazas, registros y código del informe original
Call trace: usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline] usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182 usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458 ... hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953
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: 6
- 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.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1059Command and Scripting Interpreterexecution60 %
Use-after-free en kernel Linux (CWE-416) con acceso local sin interacción (AV:L/PR:L/UI:N). El código escrito permite escalada desde usuario a kernel memory corruption, posibilitando ejecución de código arbitrario con privilegios 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
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/3dc20d1981d6a67d8184498a5da272942dde1e65
- https://git.kernel.org/stable/c/51f6532790b74ffdd6970bc848358a2838c1c185
- https://git.kernel.org/stable/c/af75b486f7e883e3422ece23c8d727e6815144a0
- https://git.kernel.org/stable/c/b9c826916fdce6419b94eb0cd8810fdac18c2386
- https://git.kernel.org/stable/c/ba88461f7653636c48321ca993006a74724c2f41
- https://git.kernel.org/stable/c/d21e8a2af4869b5890b34e081d5aeadc93e9cd5c
- https://git.kernel.org/stable/c/e247a0e01d15ed420f77ec5e2335721bf430a5b3
- https://git.kernel.org/stable/c/e719232f4552e29de8027a83918ea94434be87af
- https://git.kernel.org/stable/c/e88354b381e2006de63d6b052ed7005c9a47d00e
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: 6fire: fix use-after-free on disconnect\n\nIn usb6fire_chip_abort(), the chip struct is allocated as the card's\nprivate data (via snd_card_new with sizeof(struct sfire_chip)). When\nsnd_card_free_when_closed() is called and no file handles are open, the\ncard and embedded chip are freed synchronously. The subsequent\nchip->card = NULL write then hits freed slab memory.\n\nCall trace:\n usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline]\n usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182\n usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458\n ...\n hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953\n\nFix by moving the card lifecycle out of usb6fire_chip_abort() and into\nusb6fire_chip_disconnect(). The card pointer is saved in a local\nbefore any teardown, snd_card_disconnect() is called first to prevent\nnew opens, URBs are aborted while chip is still valid, and\nsnd_card_free_when_closed() is called last so chip is never accessed\nafter the card may be freed."
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