CVE-2026-89891
In the Linux kernel, the following vulnerability has been resolved:
media: em28xx: fix use-after-free of dev_next->devlist on disconnect
When a device with has_dual_ts=1 is probed and the is_audio_only path is taken, both dev and dev->dev_next are added to the global em28xx_devlist via em28xx_init_extension(). However, during disconnect, em28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving dev->dev_next->devlist still linked in the global list. When dev_next is subsequently freed via kref_put(), its devlist entry becomes a dangling pointer in em28xx_devlist. The next device probe that calls em28xx_init_extension() triggers a list corruption BUG when list_add_tail detects the freed node.
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This bug was exposed by commit a368ecde8a50 ("USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor") which clears reserved bits in bEndpointAddress during endpoint parsing. This causes fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which em28xx interprets as a vendor audio endpoint, enabling the is_audio_only + has_dual_ts code path that was previously unreachable with such descriptors.
Fix this by removing dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.
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: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- 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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0782807552b6aff41b4656c6c9076a3231d3e79d
- https://git.kernel.org/stable/c/16cb1ee17e093175b4d9ae33202f68e5b108cca2
- https://git.kernel.org/stable/c/1ed575b1991f68569eb589b7747d3bc26aa6a8a2
- https://git.kernel.org/stable/c/20aacd87550be297dc39a3f9532dcfff91586510
- https://git.kernel.org/stable/c/20c2c65f3d9f7c278dc9750531d3201ac8bf78b7
- https://git.kernel.org/stable/c/826915b6b65e2d3251e7248ea54289a22d748c84
- https://git.kernel.org/stable/c/da4b07da6281e39ce4c01e1227e036f3bf600e14
- https://git.kernel.org/stable/c/f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18
JSON original (NVD)
Mostrar
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"id": "CVE-2026-89891",
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],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: em28xx: fix use-after-free of dev_next->devlist on disconnect\n\nWhen a device with has_dual_ts=1 is probed and the is_audio_only path\nis taken, both dev and dev->dev_next are added to the global\nem28xx_devlist via em28xx_init_extension(). However, during disconnect,\nem28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving\ndev->dev_next->devlist still linked in the global list. When dev_next is\nsubsequently freed via kref_put(), its devlist entry becomes a dangling\npointer in em28xx_devlist. The next device probe that calls\nem28xx_init_extension() triggers a list corruption BUG when list_add_tail\ndetects the freed node.\n\nThis bug was exposed by commit a368ecde8a50 (\"USB: core: Fix duplicate\nendpoint bug by clearing reserved bits in the descriptor\") which clears\nreserved bits in bEndpointAddress during endpoint parsing. This causes\nfuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which\nem28xx interprets as a vendor audio endpoint, enabling the\nis_audio_only + has_dual_ts code path that was previously unreachable\nwith such descriptors.\n\nFix this by removing dev->dev_next->devlist from the global list in\nem28xx_close_extension() before the device is freed."
}
],
"lastModified": "2026-09-16T11:16:57.740",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}