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CVE-2025-21900

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix a deadlock when recovering state on a sillyrenamed file If the file is sillyrenamed, and slated for delete on close,…

Published Apr 1, 2025CWE-667EPSS 0.35%

Overview

CVE-2025-21900 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

If the file is sillyrenamed, and slated for delete on close, it is

possible for a server reboot to triggeer an open reclaim, with can again

race with the application call to close(). When that happens, the call

to put_nfs_open_context() can trigger a synchronous delegreturn call

which deadlocks because it is not marked as privileged.

Instead, ensure that the call to nfs4_inode_return_delegation_on_close()

catches the delegreturn, and schedules it asynchronously.

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/4fe4ae6c2e01d028856b73b6328b12b8945df871Refgit.kernel.org/stable/c/8f8df955f078e1a023ee55161935000a67651f38Refgit.kernel.org/stable/c/f41a60bc43e7abbc636fee78bed0d74c31e738b0

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21900?

CVE-2025-21900 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-21900?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21900?

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-2025-21900?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21900 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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