---
id: CVE-2025-39688
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()

  The pynfs DELEG8 test fails when run against nfsd
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()

  The pynfs DELEG8 test fails when run against nfsd. It acquires a
  delegation and then lets the l…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.11.6, < 6.12'
  - 'linux_kernel >= 6.12.1, < 6.12.23'
  - 'linux_kernel >= 6.13, < 6.13.11'
  - 'linux_kernel >= 6.14, < 6.14.2'
  - linux_kernel = 6.12
patched:
  - linux_kernel 6.14.2
published: '2025-04-18'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:50.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-39688'
references:
  - url: 'https://git.kernel.org/stable/c/52e209203c35a4fbff8af23cd3613efe5df40102'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5bcb44e650bc4ec7eac23df90c5e011a77fa2beb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dc6f3295905d7185e71091870119a8c11c3808cc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0062
epssPercentile: 0.49471
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-15T21:53:20.614527Z'
ingestedAt: '2026-10-15T22:48:25.520Z'
---

## Overview

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

nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()

The pynfs DELEG8 test fails when run against nfsd. It acquires a
delegation and then lets the lease time out. It then tries to use the
deleg stateid and expects to see NFS4ERR_DELEG_REVOKED, but it gets
bad NFS4ERR_BAD_STATEID instead.

When a delegation is revoked, it's initially marked with
SC_STATUS_REVOKED, or SC_STATUS_ADMIN_REVOKED and later, it's marked
with the SC_STATUS_FREEABLE flag, which denotes that it is waiting for
s FREE_STATEID call.

nfs4_lookup_stateid() accepts a statusmask that includes the status
flags that a found stateid is allowed to have. Currently, that mask
never includes SC_STATUS_FREEABLE, which means that revoked delegations
are (almost) never found.

Add SC_STATUS_FREEABLE to the always-allowed status flags, and remove it
from nfsd4_delegreturn() since it's now always implied.

## Affected

- `linux_kernel >= 6.11.6, < 6.12`
- `linux_kernel >= 6.12.1, < 6.12.23`
- `linux_kernel >= 6.13, < 6.13.11`
- `linux_kernel >= 6.14, < 6.14.2`
- `linux_kernel = 6.12`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.14.2`