CVE-2025-21870MediumMicrosoft CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Microsoft advisory for CVE-2025-21870 — azl3 kernel

Published
July 11, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2025-21870 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21870. This page also shows what EchelonGraph holds for CVE-2025-21870, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products19

  • azl3 kernel 6.6.104.2-4 on Azure Linux 3.0
  • azl3 kernel 6.6.112.1-2 on Azure Linux 3.0
  • azl3 kernel 6.6.117.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.119.3-1 on Azure Linux 3.0
  • azl3 kernel 6.6.119.3-3 on Azure Linux 3.0
  • azl3 kernel 6.6.121.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.126.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
  • azl3 kernel 6.6.134.1-2 on Azure Linux 3.0
  • azl3 kernel 6.6.137.1-2 on Azure Linux 3.0
  • azl3 kernel 6.6.138.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.139.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.141.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.143.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.144.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.145.2-1 on Azure Linux 3.0
  • azl3 kernel 6.6.150.1-1 on Azure Linux 3.0
  • azl3 kernel 6.6.96.2-1 on Azure Linux 3.0
  • azl3 kernel 6.6.96.2-2 on Azure Linux 3.0

🧭 EchelonGraph on CVE-2025-21870

EchelonGraph score
5.5 MEDIUM
CISA KEV
Not listed
Fix status
A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

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

Published by kernel.org, the CVE Numbering Authority that assigned CVE-2025-21870, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 References (1)