#VU106126 Division by zero in Linux kernel - CVE-2025-21874

Vulnerability identifier: #VU106126

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-2025-21874

CWE-ID: CWE-369

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 a division by zero error within the dm_integrity_status() function in drivers/md/dm-integrity.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, 6.12.1, 6.12.2, 6.12.3, 6.12.4, 6.12.5, 6.12.6, 6.12.7, 6.12.8, 6.12.9, 6.12.10, 6.12.11, 6.12.12, 6.12.13, 6.12.14, 6.12.15, 6.12.16, 6.12.17, 6.13, 6.13.1, 6.13.2, 6.13.3, 6.13.4, 6.13.5

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External links
https://git.kernel.org/stable/c/06d9895f265282e939a8933bb18de82eba2b4dda
https://git.kernel.org/stable/c/22c6f577b3cb184857b440ae5e5916f6c9e7021d
https://git.kernel.org/stable/c/7fb39882b20c98a9a393c244c86b56ef6933cff8
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.18
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.6
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14

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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.