---
id: CVE-2026-89715
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFS/localio: fix ref leak on nfs_uuid_add_file failure

  When nfs_uuid_add_file() races with nfs_uuid_put() tearing down
  uuid->net, it returns -ENXIO without publishing …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFS/localio: fix ref leak on nfs_uuid_add_file failure

  When nfs_uuid_add_file() races with nfs_uuid_put() tearing down
  uuid->net, it returns -ENXIO without publishing …
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fdd015de767977f21892329af5e12276eb80375f <
    5215e734bf7cba18237155f8cb2a0accb60ca339
  - >-
    Linux >= fdd015de767977f21892329af5e12276eb80375f <
    9f59b05423ed381f8cdeaaae4bd6778adcb6865c
  - >-
    Linux >= fdd015de767977f21892329af5e12276eb80375f <
    ca018c19e0ba38975e5ddc3ef8117d5b734313aa
  - Linux 55735dc5a0ee0c0fc14cb51e005eae862906a410
  - Linux 7cac8a129fc53497f9ee5d66fca55a245d009b97
  - Linux >= 6.15.10 < 6.16
  - Linux >= 6.16.1 < 6.17
  - Linux 6.17
published: '2026-09-11'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:19:58.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89715'
references:
  - url: 'https://git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89715.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89715'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532445'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89715'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89715'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89715.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-14T12:47:54.894Z'
epss: 0.00206
epssPercentile: 0.0952
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-911
---

## Overview

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

NFS/localio: fix ref leak on nfs_uuid_add_file failure

When nfs_uuid_add_file() races with nfs_uuid_put() tearing down
uuid->net, it returns -ENXIO without publishing nfl->nfs_uuid via
rcu_assign_pointer().  nfs_open_local_fh() then enters its error
branch and only releases the slot's file ref and its paired net
ref plus its own entry-time net ref, while the close path is a
no-op:

    nfs_close_local_fh()
      nfs_uuid = rcu_dereference(nfl->nfs_uuid);
      if (!nfs_uuid) { rcu_read_unlock(); return; }  /* always */

nfsd_open_local_fh() returns localio holding a caller-owned +1
nfsd_file reference (from nfsd_file_get() after
nfsd_file_acquire_local()) and an entry-time nfsd_net reference
(from its first nfsd_net_try_get()) embedded as nf->nf_net.  Both
are leaked on the failure path, pinning one nfsd_file (and the
underlying struct file, dentry, inode) and one nfsd_net_ref per
occurrence, which blocks nfsd_net and netns teardown.

Fix by releasing the caller-owned file ref and its net ref through
the existing helper, using a stack-local RCU pointer so the helper
can xchg it out, then returning -ENXIO so callers do not
dereference a localio whose slot has been cleared:

    struct nfsd_file __rcu *tmp = RCU_INITIALIZER(localio);

    nfs_to_nfsd_file_put_local(pnf);
    nfs_to_nfsd_file_put_local(&tmp);
    localio = ERR_PTR(-ENXIO);

The trailing nfs_to_nfsd_net_put(net) continues to release the
outer net ref, so all three nfsd_net_try_get() increments are
balanced on the error branch.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89715.json)