NULL pointer dereference in Linux kernel - CVE-2025-21870

Vulnerability identifier: #VU106114

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2025-21870

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
Confidential Computing Module
Public Cloud Module
SUSE Linux Enterprise Live Patching
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
openEuler
SmartFabric Manager
APEX Cloud Platform for Microsoft Azure
kernel-livepatch-SLE15-SP6-RT_Update_10-debugsource
kernel-livepatch-6_4_0-150600_10_34-rt
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kernel-livepatch-6_4_0-150600_23_47-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_10-debugsource
kernel-livepatch-6_4_0-150600_23_47-default
kernel-livepatch-6_4_0-150700_53_3-default
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perf
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kernel-tools-devel
linux (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-aws (Ubuntu package)
APEX Cloud Platform for Red Hat OpenShift

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the sof_ipc4_widget_setup_comp_dai() and sof_ipc4_prepare_copier_module() functions in sound/soc/sof/ipc4-topology.c. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef
• https://git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515
• https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.5