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CVE-2025-21870: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

mediumCVSS 5.5CVE-2025-21870

CSIRTS triage

vendor: Linuxproduct: Linux kernelOther
What
Hardening of loop bounds checking in ASoC SOF IPC4 topology ALH copier lookup code.
Who is affected
Systems running Linux kernel with ASoC SOF audio driver and IPC4 topology support.
Urgency
Medium severity; not exploited; audio driver stability and bounds checking improvement.
Action
Apply Linux kernel patch addressing CVE-2025-21870 to harden ALH copier loops.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21870

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-21870coverage & exploitation statusNVD · CVE.org

Recent advisories for ASoC

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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