CVE-2025-21908

Summary

CVE-2025-21908: A vulnerability in the Linux kernel NFS (Network File System) component has been identified and addressed. The issue was caused by a deadlock in the function nfs_release_folio() due to an interaction with kcompactd and writeback. This deadlock could result in a system hang, as illustrated by a task named kcompactd being blocked for over 4400 seconds. The resolution involves adding a flag and a helper function to check for kcompactd and allowing nfs_release_folio() to skip calling nfs_wb_folio() from kcompactd to prevent the deadlock.

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