CVE-2026-90032
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.
How to fix
- Linux Linux97b5e8b22b98e287481a97a9a4cfebbb348738a5, 503be26ff888cb3576e55d251895d290e8146f27, be0f7745f883386e5263b4e475686a81dfa87175, 67374e3a00814dcdd46e9feca61f69f7f2d81957, 239d1683e08b2aee2a15ef35706e1ea9a76681d8, 7690a86b193271322cd31ab77349a87aa10858e4, 1618257cb0aba4ce342ae8c0228368c24161f5fb, fc530fe168bb2b745a93f553ad21fc25fd9cba3d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 97b5e8b22b98e287481a97a9a4cfebbb348738a5, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 503be26ff888cb3576e55d251895d290e8146f27, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < be0f7745f883386e5263b4e475686a81dfa87175, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 67374e3a00814dcdd46e9feca61f69f7f2d81957, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 239d1683e08b2aee2a15ef35706e1ea9a76681d8, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 7690a86b193271322cd31ab77349a87aa10858e4, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < 1618257cb0aba4ce342ae8c0228368c24161f5fb, 63ddf68de52efaac40a9287e44266ac30e71dd36 ≤ v < fc530fe168bb2b745a93f553ad21fc25fd9cba3d, 3.18 | 97b5e8b22b98e287481a97a9a4cfebbb348738a5, 503be26ff888cb3576e55d251895d290e8146f27, be0f7745f883386e5263b4e475686a81dfa87175, 67374e3a00814dcdd46e9feca61f69f7f2d81957, 239d1683e08b2aee2a15ef35706e1ea9a76681d8, 7690a86b193271322cd31ab77349a87aa10858e4, 1618257cb0aba4ce342ae8c0228368c24161f5fb, fc530fe168bb2b745a93f553ad21fc25fd9cba3d |
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