---
id: CVE-2026-90236
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Release the export reference when reaping open stateids

  nfs4_put_stid() releases the svc_export tracked in
  nfs4_stid.sc_export, but free_ol_stateid_reaplist() fr…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Release the export reference when reaping open stateids

  nfs4_put_stid() releases the svc_export tracked in
  nfs4_stid.sc_export, but free_ol_stateid_reaplist() fr…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ba0cde5dc81d214684b8ea0bd87414ba2f48fe02 <
    7458727fd7cb79d09e5120b6fecc1ad11cdb0946
  - >-
    Linux >= ba0cde5dc81d214684b8ea0bd87414ba2f48fe02 <
    6480bd703684ed3f760e9e36c4a699033c0806ae
  - Linux 7.2
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:19.533'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90236'
references:
  - url: 'https://git.kernel.org/stable/c/6480bd703684ed3f760e9e36c4a699033c0806ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7458727fd7cb79d09e5120b6fecc1ad11cdb0946'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.848Z'
epss: 0.00201
epssPercentile: 0.10276
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Release the export reference when reaping open stateids

nfs4_put_stid() releases the svc_export tracked in
nfs4_stid.sc_export, but free_ol_stateid_reaplist() frees open and
lock stateids by calling ->sc_free() directly, bypassing that path.
An open stateid takes an sc_export reference in nfs4_open() and a
lock stateid takes its own in init_lock_stateid(); both reach
free_ol_stateid_reaplist() through their normal teardown, the open
stateid via release_open_stateid() and the lock stateid via
nfsd4_release_lockowner(), each through put_ol_stateid_locked().
The reference is therefore never dropped, pinning the export and
blocking unmount for the lifetime of the stateid.

Release sc_export in free_ol_stateid_reaplist() the way
nfs4_put_stid() does. ->sc_free() runs once per stateid, and a
stateid reaches free_ol_stateid_reaplist() or nfs4_put_stid() but
never both, so the reference is dropped exactly once. Revoked
stateids reach this path with sc_export already cleared by
drop_stid_export(), so they are skipped rather than double-freed.

nfs4_put_stid() itself read sc_export before acquiring cl_lock.
drop_stid_export() clears that field and releases the reference
under cl_lock, so a concurrent revocation could drop the export in
the window between the read and the final put, releasing the same
reference twice. Read sc_export while cl_lock is held so the two
paths serialize and the reference is released exactly once.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.