nfsd: close shrinker/GC/fsnotify vs per-net shutdown race in filecache

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Summary

CVECVE-2026-89667
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:53 UTC
Updated2026-09-11 20:19:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfsd: close shrinker/GC/fsnotify vs per-net shutdown race in filecache The shrinker, GC worker, and fsnotify/lease callbacks can unhash an nfsd_file from the rhashtable and then call nfsd_file_dispose_list_delayed() to move it to the per-net dispose list. If nfsd_file_cache_shutdown_net() runs concurrently, its rhashtable walk misses the already-unhashed file, and its drain of the per-net dispose list can run before the file has been queued. The file then sits on the per-net list with no thread to drain it, leaking both the file and its associated state. The GC worker and shrinker already hold nfsd_gc_lock while walking the LRU, but in the original code they release it before calling nfsd_file_dispose_list_delayed(). The fsnotify/lease path (nfsd_file_close_inode) has no synchronization at all. Fix this by: 1. Widening nfsd_gc_lock in both nfsd_file_gc() and nfsd_file_lru_scan() to cover the nfsd_file_dispose_list_delayed() call. 2. Wrapping nfsd_file_close_inode() in nfsd_gc_lock so that all three callers of nfsd_file_dispose_list_delayed() hold the lock. 3. Adding a spin_lock/unlock(nfsd_gc_lock) barrier in nfsd_file_cache_shutdown_net() after the purge, so that any in-progress disposal has fully completed before the per-net list is drained. All operations inside the lock are non-sleeping (rhashtable lookups, atomic bit/refcount ops, list moves, svc_wake_up), so the spinlock is appropriate.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ffb402596147ac583f3464ff5c48feb9423e3838 6d6b9f6a75c3767250e9c23ace4e384ab8f7843e git Not specified
CNA Linux Linux affected ffb402596147ac583f3464ff5c48feb9423e3838 08af9593e2b472fd98c00faf1bf03bdbb7203477 git Not specified
CNA Linux Linux affected ffb402596147ac583f3464ff5c48feb9423e3838 40162cfea79b9510380decfdd1795b754dc9f972 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/40162cfea79b9510380decfdd1795b754dc9f972 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d6b9f6a75c3767250e9c23ace4e384ab8f7843e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08af9593e2b472fd98c00faf1bf03bdbb7203477 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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