CVE-2025-38486

What it actually does

The change reverts addition of set_channel_map API support in the Qualcomm soundwire driver, correcting an implementation that could affect channel configuration handling in the kernel audio subsystem.

Why it matters to the business

Systems using the affected kernel code may experience audio driver instability or unexpected behavior until updated, with limited operational impact given low exploit likelihood and prevalence in specific Linux distributions.

How an attack unfolds

An attacker with local access would attempt to invoke the reverted API paths in the soundwire qcom driver to trigger the flawed channel mapping logic; no public exploitation or threat actor campaigns are associated with this issue.

How to fix it

Update affected packages to the fixed versions: zoneminder to 1.29.0+dfsg-1ubuntu2+esm1 on Ubuntu Pro 16.04 LTS, or the Linux kernel to commit 207cea8b72fcbdf4e6db178e54186ed4f1514b3c in the stable repository.

How to confirm the fix worked

Confirm the installed kernel or package version matches or exceeds the listed fixed commits or releases, and verify the reverted API is no longer present in the soundwire qcom driver source.

Typical attack path

1. Obtain local access to an affected system
2. Trigger soundwire driver functions involving channel mapping
3. Exploit resulting instability or corruption if conditions align

How to detect it

Review system logs for soundwire or qcom driver errors around channel mapping calls; check kernel version history and package changelogs for the revert commit on affected hosts.

What your security team should do

• Apply the listed fixed versions or commits immediately on all affected systems
• Monitor for any audio subsystem issues during rollout
• Review downstream dependents for similar kernel configurations