{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72472",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-72472"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "nfs: use nfsi->rwsem to protect traversal of the file lock list",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: use nfsi->rwsem to protect traversal of the file lock list\n\nLingfeng identified a bug and suggested two solutions, but both appear\nto have issues.\n\nGenerally, we cannot release flc_lock while iterating over the file lock\nlist to avoid use-after-free (UAF) problems with file locks. However,\nfunctions like nfs_delegation_claim_locks and nfs4_reclaim_locks cannot\nadhere to this rule because recover_lock or nfs4_lock_delegation_recall\nmay take a long time. To resolve this, NFS switches to using nfsi->rwsem\nfor the same protection, and nfs_reclaim_locks follows this approach.\nAlthough nfs_delegation_claim_locks uses so_delegreturn_mutex instead,\nthis is inadequate since a single inode can have multiple nfs4_state\ninstances. Therefore, the fix is to also use nfsi->rwsem in this case.\n\nFurthermore, after commit c69899a17ca4 (\"NFSv4: Update of VFS byte range\nlock must be atomic with the stateid update\"), the functions\nnfs4_locku_done and nfs4_lock_done also break this rule because they\ncall locks_lock_inode_wait without holding nfsi->rwsem. Simply adding\nthis protection could cause many deadlocks, so instead, the call to\nlocks_lock_inode_wait is moved into _nfs4_proc_setlk. Regarding the bug\nfixed by commit c69899a17ca4 (\"NFSv4: Update of VFS byte range\nlock must be atomic with the stateid update\"), it has been resolved\nafter commit 0460253913e5 (\"NFSv4: nfs4_do_open() is incorrectly triggering\nstate recovery\") because all slots are drained before calling\nnfs4_do_reclaim, which prevents concurrent stateid changes along this path.\nAlso, nfs_delegation_claim_locks does not cause this concurrency either\nsince when _nfs4_proc_setlk is called with NFS_DELEGATED_STATE, no RPC is\nsent, so nfs4_lock_done is not called. Therefore,\nnfs4_lock_delegation_recall from nfs_delegation_claim_locks is the first\ntime the stateid is set.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72472"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1cda95bf2e9c0e6b63545b7565fe4a1e474322f4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f161ef7b0dd2f51fdb002ba4a4e9bf0ee7409218"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e68035178e65e2b3aa386ce61202ff33724ae418"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4837fb36219e6c08b666bc31a86841bad8526358"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z"
  }
}