Linux Kernel usbtv Driver Use-After-Free via ALSA PCM Callbacks
CVE-2026-90032 Published on September 16, 2026
media: usbtv: keep device alive while ALSA card exists
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.
Products Associated with CVE-2026-90032
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Affected Versions
Linux:- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 97b5e8b22b98e287481a97a9a4cfebbb348738a5 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 503be26ff888cb3576e55d251895d290e8146f27 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below be0f7745f883386e5263b4e475686a81dfa87175 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 67374e3a00814dcdd46e9feca61f69f7f2d81957 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 239d1683e08b2aee2a15ef35706e1ea9a76681d8 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 7690a86b193271322cd31ab77349a87aa10858e4 is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below 1618257cb0aba4ce342ae8c0228368c24161f5fb is affected.
- Version 63ddf68de52efaac40a9287e44266ac30e71dd36 and below fc530fe168bb2b745a93f553ad21fc25fd9cba3d is affected.
- Version 3.18 is affected.
- Before 3.18 is unaffected.
- Version 5.10.270, <= 5.10.* is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.