CVE-2025-37889 ASoC: ops: Consistently treat platform_max as control value
Inconsistent handling of platform_max in Linux kernel audio controls could lead to unexpected volume behavior or minor logic errors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-37889?
CVE-2025-37889 is a medium-severity vulnerability in Debian Debian Linux, published on 9 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-37889?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-37889?
Apply the vendor's patch.
Is CVE-2025-37889 being exploited?
There is no known exploitation of CVE-2025-37889 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-37889, DEBIAN-CVE-2025-37889, GHSA-hggp-38jg-4c95, ROOT-OS-DEBIAN-12-CVE-2025-37889, ROOT-OS-UBUNTU-2404-CVE-2025-37889, UBUNTU-CVE-2025-37889.