#VU103120 Out-of-bounds read in Linux kernel - CVE-2025-21664

Vulnerability identifier: #VU103120

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-2025-21664

CWE-ID: CWE-125

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 an out-of-bounds read error within the get_first_thin() function in drivers/md/dm-thin.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

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External links
https://git.kernel.org/stable/c/12771050b6d059eea096993bf2001da9da9fddff
https://git.kernel.org/stable/c/6b305e98de0d225ccebfb225730a9f560d28ecb0
https://git.kernel.org/stable/c/80f130bfad1dab93b95683fc39b87235682b8f72
https://git.kernel.org/stable/c/cbd0d5ecfa390ac29c5380200147d09c381b2ac6

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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.