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CVE-2025-38534

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix copy-to-cache so that it performs collection with ceph+fscache The netfs copy-to-cache that is used by Ceph with loc…

Published Aug 16, 2025EPSS 0.13%

Overview

CVE-2025-38534 is a medium-severity vulnerability. It was published on August 16, 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:

netfs: Fix copy-to-cache so that it performs collection with ceph+fscache

The netfs copy-to-cache that is used by Ceph with local caching sets up a

new request to write data just read to the cache. The request is started

and then left to look after itself whilst the app continues. The request

gets notified by the backing fs upon completion of the async DIO write, but

then tries to wake up the app because NETFS_RREQ_OFFLOAD_COLLECTION isn't

set - but the app isn't waiting there, and so the request just hangs.

Fix this by setting NETFS_RREQ_OFFLOAD_COLLECTION which causes the

notification from the backing filesystem to put the collection onto a work

queue instead.

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/1ebe58cef84eab22b41b4d5e72c2051ebf00af50Refgit.kernel.org/stable/c/4c238e30774e3022a505fa54311273add7570f13

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38534?

CVE-2025-38534 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38534?

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-2025-38534?

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-2025-38534?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38534 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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