CVE-2026-98837
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
ALSA: caiaq: anular el registro del dispositivo de entrada cuando falla la sonda
setup_card() registra el dispositivo de entrada, cuyos campos name y phys apuntan a struct snd_usb_caiaqdev, y a continuación llama a snd_card_register() y a snd_usb_caiaq_control_init(). Si cualquiera de las dos falla, snd_probe() llama a snd_card_free(), que libera el estado del dispositivo pero deja el dispositivo de entrada registrado: card_free() solo limpia el puntero, y el dispositivo de entrada solo se desregistra desde snd_disconnect(). Si después se lee su atributo "uevent", se desreferencia memoria ya liberada:
Leer descripción completaMostrar menos
Anular el registro del dispositivo de entrada en la ruta de error de la sonda, como hace snd_disconnect(). snd_usb_caiaq_input_disconnect() no hace nada cuando no se ha registrado ningún dispositivo de entrada.
Reproducido con un Audio Kontrol 1 emulado mediante raw-gadget y una modificación temporal que hace que snd_usb_caiaq_control_init() falle.
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0 Read of size 1 at addr ffff8880208f5043 by task caiaq/4967 add_uevent_var+0x183/0x3a0 input_dev_uevent+0x162/0x900 dev_uevent+0x2f1/0x870 uevent_show+0x1ca/0x3a0 ...
Traducción automática del texto original de NVD (en inglés).
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días
- 0.20 %
- Percentil entre todas las CVEs puntuadas
- 9
- Fecha de la puntuación
- 20/10/2026
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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
Mostrar las 4 referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98837",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6251e3e256337a30160ef59ab1580dde4d1acd28",
"lessThan": "850810c12686f80cdf7530f4f21e0157d904f739",
"versionType": "git"
},
{
"status": "affected",
"version": "e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056",
"lessThan": "84727facd8506140cd04f2b0a8b1c4ddeac41cea",
"versionType": "git"
},
{
"status": "affected",
"version": "28abd224db4a49560b452115bca3672a20e45b2f",
"lessThan": "2e5a413cc2a489c9427ecd3d73ad764bfb0c7103",
"versionType": "git"
},
{
"status": "affected",
"version": "28abd224db4a49560b452115bca3672a20e45b2f",
"lessThan": "0b7bd20f6379bc5e431fd74d866390f5b5b63f3c",
"versionType": "git"
},
{
"status": "affected",
"version": "da938aa9fc7826901921dcea225948ab21a97e45",
"versionType": "git"
},
{
"status": "affected",
"version": "09616e25f502080ba684fc7fcf959d1376ab756d",
"versionType": "git"
},
{
"status": "affected",
"version": "b956e48371f2ff72b76be9a829800ecec963bd45",
"versionType": "git"
},
{
"status": "affected",
"version": "f537e3ad69609f6924a4db6b4a7f6561f5288bdd",
"versionType": "git"
},
{
"status": "affected",
"version": "096dd8519cf2f768e9e14f224b627f7aaee1a9c5",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.86",
"lessThan": "6.12.113",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.27",
"lessThan": "6.18.56",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.258",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.209",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.175",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.140",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "7.0.4",
"lessThan": "7.1",
"versionType": "semver"
}
],
"programFiles": [
"sound/usb/caiaq/device.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"sound/usb/caiaq/device.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:37.943",
"references": [
{
"url": "https://git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: unregister the input device when probe fails\n\nsetup_card() registers the input device, whose name and phys point into\nstruct snd_usb_caiaqdev, and then goes on to snd_card_register() and\nsnd_usb_caiaq_control_init(). If either fails, snd_probe() calls\nsnd_card_free(), which frees the device state but leaves the input\ndevice registered: card_free() only clears the pointer, and the input\ndevice is unregistered from snd_disconnect() alone. Reading its \"uevent\"\nattribute afterwards dereferences freed memory:\n\n BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0\n Read of size 1 at addr ffff8880208f5043 by task caiaq/4967\n add_uevent_var+0x183/0x3a0\n input_dev_uevent+0x162/0x900\n dev_uevent+0x2f1/0x870\n uevent_show+0x1ca/0x3a0\n ...\n\nUnregister the input device on the probe error path, as\nsnd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when\nno input device was registered.\n\nReproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that\nmakes snd_usb_caiaq_control_init() fail."
}
],
"lastModified": "2026-10-19T10:19:47.743",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}