#VU105069 Buffer overflow in Linux kernel - CVE-2025-21738

Vulnerability identifier: #VU105069

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-2025-21738

CWE-ID: CWE-119

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 memory corruption within the ata_pio_sector() function in drivers/ata/libata-sff.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.6 - 6.6.77

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External links
https://git.kernel.org/stable/c/0a17a9944b8d89ef03946121241870ac53ddaf45
https://git.kernel.org/stable/c/0dd5aade301a10f4b329fa7454fdcc2518741902
https://git.kernel.org/stable/c/6e74e53b34b6dec5a50e1404e2680852ec6768d2
https://git.kernel.org/stable/c/a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c
https://git.kernel.org/stable/c/d5e6e3000309359eae2a17117aa6e3c44897bf6c
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.78

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?