{
  "cveId": "CVE-2026-89686",
  "url": "https://patchblox.com/security/cve/CVE-2026-89686",
  "summary": "CVE-2026-89686 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-89686, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke  nfsd4_alloc_layout_stateid reads fp-\u003Efi_deleg_file without holding fi_lock when the parent stateid is a delegation. A concurrent delegation revoke via the laundromat can clear fi_deleg_file under fi_lock, causing nfsd_file_get() to return NULL and triggering the BUG_ON.  This race is client-reachable: two NFS clients can trigger it by having one hold a delegation while another opens the same file to force a recall. When the first client doesn\u0027t respond to the recall, the laundromat revokes it. A concurrent LAYOUTGET from any client using the delegation stateid hits the race window.  Fix this by taking fi_lock around the fi_deleg_file read in the SC_TYPE_DELEG path, matching the locking discipline of the find_any_file() arm, and replacing the BUG_ON with a graceful error return that cleans up the partially-initialized layout stateid.",
  "published": "2026-09-11T20:19:55Z",
  "severity": "Moderate",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00712,
  "epssPercentile": 0.53837,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89686",
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