CVE-2026-90032

media: usbtv: keep device alive while ALSA card exists

State: Published
Severity: 7.8 High
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	63ddf68de52efaac40a9287e44266ac30e71dd36 to before 97b5e8b22b98e287481a97a9a4cfebbb348738a5Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before 503be26ff888cb3576e55d251895d290e8146f27Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before be0f7745f883386e5263b4e475686a81dfa87175Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before 67374e3a00814dcdd46e9feca61f69f7f2d81957Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before 239d1683e08b2aee2a15ef35706e1ea9a76681d8Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before 7690a86b193271322cd31ab77349a87aa10858e4Affected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before 1618257cb0aba4ce342ae8c0228368c24161f5fbAffected 63ddf68de52efaac40a9287e44266ac30e71dd36 to before fc530fe168bb2b745a93f553ad21fc25fd9cba3dAffected
LinuxLinux	3.18Affected before 3.18Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

63ddf68de52efaac40a9287e44266ac30e71dd36 to before 97b5e8b22b98e287481a97a9a4cfebbb348738a5Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before 503be26ff888cb3576e55d251895d290e8146f27Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before be0f7745f883386e5263b4e475686a81dfa87175Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before 67374e3a00814dcdd46e9feca61f69f7f2d81957Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before 239d1683e08b2aee2a15ef35706e1ea9a76681d8Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before 7690a86b193271322cd31ab77349a87aa10858e4Affected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before 1618257cb0aba4ce342ae8c0228368c24161f5fbAffected
63ddf68de52efaac40a9287e44266ac30e71dd36 to before fc530fe168bb2b745a93f553ad21fc25fd9cba3dAffected

LinuxLinux

3.18Affected
before 3.18Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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