---
id: CVE-2026-89669
title: 'nfsd: initialize copy-notify stateid before publishing it'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: initialize copy-notify stateid before publishing it

  nfsd4_copy_notify() finished initializing the cpntf state after
  nfs4_alloc_init_cpntf_state() had already lin…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    863b6e995665472f2af5be2436a874ab6a9e5ac6
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    d18d36395d973ef7372c8e6724970585f75b5c0b
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    4415a692346a39fdb647cbd717eda510159aaf55
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    9caad13b7cfe9ccb90cc405ac77335800e086595
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    e08a3dcaca0505f861e344a387f37f94d95dbdc2
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    a4d7fedcaaf33e60a01e53eafca9041ef966212f
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b
  - >-
    Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 <
    129643893b79f8a3c6b72045f933fbab5ee424ca
  - Linux 5.6
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:50:42.637Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89669'
references:
  - url: 'https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6'
  - url: 'https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b'
  - url: 'https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55'
  - url: 'https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595'
  - url: 'https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2'
  - url: 'https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f'
  - url: 'https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b'
  - url: 'https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89669'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532111'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89669'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89669'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89669.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00694
epssPercentile: 0.5274
scores:
  cna: 9.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

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

nfsd: initialize copy-notify stateid before publishing it

nfsd4_copy_notify() finished initializing the cpntf state after
nfs4_alloc_init_cpntf_state() had already linked it into the
s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the
membership reference) and none held for the caller. A racing
OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable
so_id) could reach manage_cpntf_state() and free the entry, turning the
caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid
writes into use-after-free. The owning clientid was also only recorded
after publication, so it could not gate an ownership check in that window.

Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state()
before nfs4_init_cp_state() publishes the entry, and return it with an
extra reference. The caller reads the stateid under that reference and
drops it with nfs4_put_cpntf_state(); on a late error the laundromat
reaps the entry.

## Affected

- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < 863b6e995665472f2af5be2436a874ab6a9e5ac6`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < d18d36395d973ef7372c8e6724970585f75b5c0b`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < 4415a692346a39fdb647cbd717eda510159aaf55`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < 9caad13b7cfe9ccb90cc405ac77335800e086595`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < e08a3dcaca0505f861e344a387f37f94d95dbdc2`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < a4d7fedcaaf33e60a01e53eafca9041ef966212f`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b`
- `Linux >= 624322f1adc58acd0b69f77a6ddc764207e97241 < 129643893b79f8a3c6b72045f933fbab5ee424ca`
- `Linux 5.6`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json)