{
  "cveId": "CVE-2026-89667",
  "url": "https://patchblox.com/security/cve/CVE-2026-89667",
  "summary": "CVE-2026-89667 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89667, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: close shrinker/GC/fsnotify vs per-net shut...",
  "description": "In 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.",
  "published": "2026-09-11T20:19:53Z",
  "severity": "high",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00537,
  "epssPercentile": 0.45486,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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