CVE-2025-38534 Details
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.
A vulnerability in the Linux kernel's netfs component affects the copy-to-cache mechanism used by Ceph with local caching. The issue arises because the system initiates a request to write recently read data to the cache and then allows the application to proceed without waiting for the request to complete. Although the backing filesystem notifies the completion of the asynchronous direct I/O write, the request attempts to alert the application without the proper offload collection flag set, causing the request to hang. This vulnerability has been addressed by modifying the netfs implementation to include the offload collection flag, enabling the notification from the backing filesystem to be processed correctly.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1ebe58cef84eab22b41b4d5e72c2051ebf00af50 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4c238e30774e3022a505fa54311273add7570f13 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.14, < 6.15.8 6.16 rc1 6.16 rc2 6.16 rc3 6.16 rc4 6.16 rc5 6.16 rc6 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Nov 18, 2025 | Initial Analysis | [email protected] |
| Aug 16, 2025 | New CVE Received | kernel.org |