{"cve":"CVE-2026-23050","nvd":{"published":"2026-02-04T17:16:15.663","modified":"2026-10-30T13:18:33.480","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/05a685b38dbca489d5f21eac9e7f20959344076a","https://git.kernel.org/stable/c/857bf9056291a16785ae3be1d291026b2437fc48","https://git.kernel.org/stable/c/a316fd9d3065b753b03d802530004aea481512cc","https://git.kernel.org/stable/c/c57387d447a2bcbaea009ba5f9497adf3de5edeb","https://git.kernel.org/stable/c/d6c75aa9d607044d1e5c8498eff0259eed356c32"],"products":[],"source":"nvd","synced_at":"2026-10-30T13:47:47.119061695+00:00"},"epss":{"cve":"CVE-2026-23050","score":0.00197,"percentile":0.09418,"date":"2026-10-30"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}