{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23050",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23050"
  ],
  "published": "2026-02-04T16:05:00Z",
  "summary": "pNFS: Fix a deadlock when returning a delegation during open()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix a deadlock when returning a delegation during open()\n\nBen Coddington reports seeing a hang in the following stack trace:\n  0 [ffffd0b50e1774e0] __schedule at ffffffff9ca05415\n  1 [ffffd0b50e177548] schedule at ffffffff9ca05717\n  2 [ffffd0b50e177558] bit_wait at ffffffff9ca061e1\n  3 [ffffd0b50e177568] __wait_on_bit at ffffffff9ca05cfb\n  4 [ffffd0b50e1775c8] out_of_line_wait_on_bit at ffffffff9ca05ea5\n  5 [ffffd0b50e177618] pnfs_roc at ffffffffc154207b [nfsv4]\n  6 [ffffd0b50e1776b8] _nfs4_proc_delegreturn at ffffffffc1506586 [nfsv4]\n  7 [ffffd0b50e177788] nfs4_proc_delegreturn at ffffffffc1507480 [nfsv4]\n  8 [ffffd0b50e1777f8] nfs_do_return_delegation at ffffffffc1523e41 [nfsv4]\n  9 [ffffd0b50e177838] nfs_inode_set_delegation at ffffffffc1524a75 [nfsv4]\n 10 [ffffd0b50e177888] nfs4_process_delegation at ffffffffc14f41dd [nfsv4]\n 11 [ffffd0b50e1778a0] _nfs4_opendata_to_nfs4_state at ffffffffc1503edf [nfsv4]\n 12 [ffffd0b50e1778c0] _nfs4_open_and_get_state at ffffffffc1504e56 [nfsv4]\n 13 [ffffd0b50e177978] _nfs4_do_open at ffffffffc15051b8 [nfsv4]\n 14 [ffffd0b50e1779f8] nfs4_do_open at ffffffffc150559c [nfsv4]\n 15 [ffffd0b50e177a80] nfs4_atomic_open at ffffffffc15057fb [nfsv4]\n 16 [ffffd0b50e177ad0] nfs4_file_open at ffffffffc15219be [nfsv4]\n 17 [ffffd0b50e177b78] do_dentry_open at ffffffff9c09e6ea\n 18 [ffffd0b50e177ba8] vfs_open at ffffffff9c0a082e\n 19 [ffffd0b50e177bd0] dentry_open at ffffffff9c0a0935\n\nThe issue is that the delegreturn is being asked to wait for a layout\nreturn that cannot complete because a state recovery was initiated. The\nstate recovery cannot complete until the open() finishes processing the\ndelegations it was given.\n\nThe solution is to propagate the existing flags that indicate a\nnon-blocking call to the function pnfs_roc(), so that it knows not to\nwait in this situation.",
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