CVE-2026-90032 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0015

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8 https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27 https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957 https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4 https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5 https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175 https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d

Frequently Asked Questions

What is CVE-2026-90032? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90032? +

CVE-2026-90032 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0015, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90032? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-90032