#VU107798 Input validation error in Linux kernel - CVE-2025-39688

Vulnerability identifier: #VU107798

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-2025-39688

CWE-ID: CWE-20

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 improper input validation within the nfsd4_lookup_stateid() and nfsd4_delegreturn() functions in fs/nfsd/nfs4state.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13, 6.13.1, 6.13.2, 6.13.3, 6.13.4, 6.13.5, 6.13.6, 6.13.7, 6.13.8, 6.13.9, 6.13.10

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External links
https://git.kernel.org/stable/c/52e209203c35a4fbff8af23cd3613efe5df40102
https://git.kernel.org/stable/c/5bcb44e650bc4ec7eac23df90c5e011a77fa2beb
https://git.kernel.org/stable/c/d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13
https://git.kernel.org/stable/c/dc6f3295905d7185e71091870119a8c11c3808cc
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.11

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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.