#VU105032 Input validation error in Linux kernel - CVE-2025-21746

Vulnerability identifier: #VU105032

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-2025-21746

CWE-ID: CWE-20

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 improper input validation within the synaptics_pt_stop(), synaptics_pt_create() and synaptics_process_byte() functions in drivers/input/mouse/synaptics.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13, 6.13.1, 6.13.2

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External links
https://git.kernel.org/stable/c/08bd5b7c9a2401faabdaa1472d45c7de0755fd7e
https://git.kernel.org/stable/c/87da1ea93ec9f9f0004e5b12e78789bc94e360bf
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.3

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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.