#VU106114 NULL pointer dereference in Linux kernel - CVE-2025-21870

Vulnerability identifier: #VU106114

Vulnerability risk: Low

CVSSv4.0: 4.3 [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

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef
https://git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515
https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.