CVE-2026-90032
Published: September 18, 2026Last modified: October 6, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.189-r0) |
| 25 LTS | linux-lts | Fixed (6.12.111-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
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