ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers
CVE-2025-21870 · published 27 Mar 2025
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2025-21870?
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Who is affected
- Linux Linux: a150345aa758492e05d2934f318ce7c2566b1cfe to < 6b6b47c1aa717a0ed3400e00a81dfea686a41d7f, a150345aa758492e05d2934f318ce7c2566b1cfe to < 87c8768a96092ce75cd47fe076db5080db7ac515, a150345aa758492e05d2934f318ce7c2566b1cfe to < 93c6c2e5801aab09ef1ef99f248f3cd323c3f152, a150345aa758492e05d2934f318ce7c2566b1cfe to < 6fd60136d256b3b948333ebdb3835f41a95ab7ef
- Linux Linux: 6.0
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
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- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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
Check your whole app
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References
- git.kernel.org/stable/c/6b6b47c1aa717a0ed3400e00a81dfea686a41d7f
- git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515
- git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152
- git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON