{
  "cveId": "CVE-2026-72472",
  "url": "https://patchblox.com/security/cve/CVE-2026-72472",
  "summary": "CVE-2026-72472 is fixed in 73 products on 1 platform, first by DEBIAN-CVE-2026-72472, released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nfs: use nfsi-\u003Erwsem to protect traversal of the file lock list",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfs: use nfsi-\u003Erwsem to protect traversal of the file lock list  Lingfeng identified a bug and suggested two solutions, but both appear to have issues.  Generally, we cannot release flc_lock while iterating over the file lock list to avoid use-after-free (UAF) problems with file locks. However, functions like nfs_delegation_claim_locks and nfs4_reclaim_locks cannot adhere to this rule because recover_lock or nfs4_lock_delegation_recall may take a long time. To resolve this, NFS switches to using nfsi-\u003Erwsem for the same protection, and nfs_reclaim_locks follows this approach. Although nfs_delegation_claim_locks uses so_delegreturn_mutex instead, this is inadequate since a single inode can have multiple nfs4_state instances. Therefore, the fix is to also use nfsi-\u003Erwsem in this case.  Furthermore, after commit c69899a17ca4 (\u0022NFSv4: Update of VFS byte range lock must be atomic with the stateid update\u0022), the functions nfs4_locku_done and nfs4_lock_done also break this rule because they call locks_lock_inode_wait without holding nfsi-\u003Erwsem. Simply adding this protection could cause many deadlocks, so instead, the call to locks_lock_inode_wait is moved into _nfs4_proc_setlk. Regarding the bug fixed by commit c69899a17ca4 (\u0022NFSv4: Update of VFS byte range lock must be atomic with the stateid update\u0022), it has been resolved after commit 0460253913e5 (\u0022NFSv4: nfs4_do_open() is incorrectly triggering state recovery\u0022) because all slots are drained before calling nfs4_do_reclaim, which prevents concurrent stateid changes along this path. Also, nfs_delegation_claim_locks does not cause this concurrency either since when _nfs4_proc_setlk is called with NFS_DELEGATED_STATE, no RPC is sent, so nfs4_lock_done is not called. Therefore, nfs4_lock_delegation_recall from nfs_delegation_claim_locks is the first time the stateid is set.",
  "published": "2026-08-15T06:22:21Z",
  "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": 0.00652,
  "epssPercentile": 0.51538,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72472",
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