CVE-2025-38534
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-16

Last updated on: 2025-11-18

Assigner: kernel.org

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-08-16
Last Modified
2025-11-18
Generated
2026-05-07
AI Q&A
2025-08-16
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38534
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-NVD-CWE-noinfo
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is in the Linux kernel's netfs copy-to-cache mechanism used by Ceph with local caching. The issue occurs because the system starts an asynchronous write request to cache data but does not properly manage the request's completion notification. Specifically, the request tries to wake up the application after the write completes, but the application is no longer waiting, causing the request to hang. The fix involves setting a flag (NETFS_RREQ_OFFLOAD_COLLECTION) so that the completion notification is handled via a work queue, preventing the request from hanging.


How can this vulnerability impact me? :

This vulnerability can cause asynchronous write requests in the netfs copy-to-cache process to hang, potentially leading to stalled operations or degraded performance when using Ceph with local caching in the Linux kernel. This may affect system stability or responsiveness during caching operations.


Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart