#VU106845 Buffer overflow in Linux kernel - CVE-2025-21966

Vulnerability identifier: #VU106845

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21966

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 escalate privileges on the system.

The vulnerability exists due to memory corruption within the clone_bio() function in drivers/md/dm-flakey.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.7

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External links
https://git.kernel.org/stable/c/57e9417f69839cb10f7ffca684c38acd28ceb57b
https://git.kernel.org/stable/c/5a87e46da2418c57b445371f5ca0958d5779ba5f
https://git.kernel.org/stable/c/818330f756f3800c37d738bd36bce60eac949938
https://git.kernel.org/stable/c/da070843e153471be4297a12fdaa64023276f40e
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.8

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?