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CVE-2025-21870

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers Other, non DAI copier widgets could have the same stream nam…

Published Mar 27, 2025CWE-476EPSS 0.20%

Overview

CVE-2025-21870 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

Other, non DAI copier widgets could have the same stream name (sname) as

the ALH copier and in that case the copier->data is NULL, no alh_data is

attached, which could lead to NULL pointer dereference.

We could check for this NULL pointer in sof_ipc4_prepare_copier_module()

and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()

will miscalculate the ALH device count, causing broken audio.

The correct fix is to harden the matching logic by making sure that the

1. widget is a DAI widget - so dai = w->private is valid

2. the dai (and thus the copier) is ALH copier

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7efRefgit.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515Refgit.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21870?

CVE-2025-21870 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21870?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21870?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21870?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21870 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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