CVE-2026-90032

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 97b5e8b22b98e287481a97a9a4cfebbb348738a5affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 503be26ff888cb3576e55d251895d290e8146f27affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < be0f7745f883386e5263b4e475686a81dfa87175affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 67374e3a00814dcdd46e9feca61f69f7f2d81957affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 239d1683e08b2aee2a15ef35706e1ea9a76681d8affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 7690a86b193271322cd31ab77349a87aa10858e4affected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < 1618257cb0aba4ce342ae8c0228368c24161f5fbaffected
LinuxLinux63ddf68de52efaac40a9287e44266ac30e71dd36 < fc530fe168bb2b745a93f553ad21fc25fd9cba3daffected
LinuxLinux3.18affected
LinuxLinux0 < 3.18unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References