#VU107646 Memory leak in Linux kernel - CVE-2025-39989

Vulnerability identifier: #VU107646

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-2025-39989

CWE-ID: CWE-401

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 leak within the error_context() function in arch/x86/kernel/cpu/mce/severity.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/0b8388e97ba6a8c033f9a8b5565af41af07f9345
https://git.kernel.org/stable/c/1a15bb8303b6b104e78028b6c68f76a0d4562134
https://git.kernel.org/stable/c/3e3d8169c0950a0b3cd5105f6403a78350dcac80
https://git.kernel.org/stable/c/449413da90a337f343cc5a73070cbd68e92e8a54

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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.