#VU105139 NULL pointer dereference in Linux kernel - CVE-2025-21798

Vulnerability identifier: #VU105139

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-2025-21798

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 device_attr_simple_avc() and device_attr_legacy_avc() functions in drivers/firewire/device-attribute-test.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12 - 6.12.12

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External links
https://git.kernel.org/stable/c/352fafe97784e81a10a7c74bd508f71a19b53c2a
https://git.kernel.org/stable/c/70fcb25472d90dd3b87cbee74b9eb68670b0c7b8
https://git.kernel.org/stable/c/c6896bf4c611c3dd126f3e03685f2360a18b3d6f
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.13

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?