CVE-2026-90032
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the media: usbtv driver has a use-after-free. ALSA PCM callbacks store driver state in pcm->private_data, and an open PCM file can outlive USB disconnect because usbtv_audio_free() uses snd_card_free_when_closed(). The disconnect path can free struct usbtv before ALSA releases the substream, causing a use-after-free in snd_usbtv_pcm_close().
Risk Assessment
Can lead to a kernel crash (panic) or potential kernel-context code execution during USB device disconnect. Requires physical access to a USB port or the ability to disconnect the device.
Recommendation
Update the Linux kernel to a version containing the fix that takes a V4L2 device reference for the ALSA card and drops it in private_free. If updating is not possible, avoid disconnecting usbtv devices during active audio playback.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

