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CVE-2025-38231

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: nfsd: Initialize ssc before laundromat_work to prevent NULL dereference In nfs4_state_start_net(), laundromat_work may access n…

Published Jul 4, 2025CWE-476EPSS 0.18%

Overview

CVE-2025-38231 is a medium-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: Initialize ssc before laundromat_work to prevent NULL dereference

In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through

nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized,

this can cause NULL pointer dereference.

Normally the delayed start of laundromat_work allows sufficient time for

nfsd_ssc initialization to complete. However, when the kernel waits too

long for userspace responses (e.g. in nfs4_state_start_net ->

nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done ->

cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the

delayed work may start before nfsd_ssc initialization finishes.

Fix this by moving nfsd_ssc initialization before starting laundromat_work.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55eRefgit.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236Refgit.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64Refgit.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4edRefgit.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8Refgit.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0Refgit.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38231?

CVE-2025-38231 is a medium-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38231?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38231?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38231?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38231 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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