CVE-2026-90032

In the Linux kernel, the following vulnerability has been resolved: media: usbtv: keep device alive while ALSA card exists The ALSA PCM callbacks store the driver state in pcm->private_data. An open PCM file can outlive USB disconnect because usbtv_audio_free() uses snd_card_free_when_closed(). The disconnect path can then drop the V4L2 device reference and free struct usbtv before ALSA releases the substream, so a later close dereferences freed memory in snd_usbtv_pcm_close(). Take a V4L2 device reference for the ALSA card and drop it from the card private_free callback. This keeps struct usbtv valid until ALSA has closed the remaining files and freed the card.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb
https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8
https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27
https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957
https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4
https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5
https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175
https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d

Configurations

No configuration.

History

16 Sep 2026, 15:18

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

Information

Published : 2026-09-16 11:17

Updated : 2026-09-16 15:18

NVD link : CVE-2026-90032

Mitre link : CVE-2026-90032

CVE.ORG link : CVE-2026-90032

JSON object : View

Products Affected

No product.

CWE

No CWE.

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An\nopen PCM file can outlive USB disconnect because usbtv_audio_free() uses\nsnd_card_free_when_closed(). The disconnect path can then drop the V4L2\ndevice reference and free struct usbtv before ALSA releases the substream,\nso a later close dereferences freed memory in snd_usbtv_pcm_close().\n\nTake a V4L2 device reference for the ALSA card and drop it from the card\nprivate_free callback. This keeps struct usbtv valid until ALSA has closed\nthe remaining files and freed the card."}], "lastModified": "2026-09-16T15:18:26.280", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}