---
id: CVE-2025-38724
title: 'nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()

  Lei Lu recently reported that nfsd4_setclientid_confirm() did not check
  the return value from g…
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
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    3f252a73e81aa01660cb426735eab932e6182e8d
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    d35ac850410966010e92f401f4e21868a9ea4d8b
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    f3aac6cf390d8b80e1d82975faf4ac61175519c0
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    22f45cedf281e6171817c8a3432c44d788c550e1
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    d71abd1ae4e0413707cd42b10c24a11d1aa71772
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    74ad36ed60df561a303a19ecef400c7096b20306
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    36e83eda90e0e4ac52f259f775b40b2841f8a0a3
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1
  - >-
    Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f <
    908e4ead7f757504d8b345452730636e298cbf68
  - Linux 3.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-10T20:40:31.454640Z'
published: '2025-09-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:07:47.670Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38724'
references:
  - url: 'https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d'
  - url: 'https://git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8b'
  - url: 'https://git.kernel.org/stable/c/f3aac6cf390d8b80e1d82975faf4ac61175519c0'
  - url: 'https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1'
  - url: 'https://git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772'
  - url: 'https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306'
  - url: 'https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3'
  - url: 'https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1'
  - url: 'https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68'
tags:
  - cve.org
epss: 0.0039
epssPercentile: 0.32957
ingestedAt: '2026-10-15T05:52:46.081Z'
---

## Overview

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

nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()

Lei Lu recently reported that nfsd4_setclientid_confirm() did not check
the return value from get_client_locked(). a SETCLIENTID_CONFIRM could
race with a confirmed client expiring and fail to get a reference. That
could later lead to a UAF.

Fix this by getting a reference early in the case where there is an
extant confirmed client. If that fails then treat it as if there were no
confirmed client found at all.

In the case where the unconfirmed client is expiring, just fail and
return the result from get_client_locked().

## Affected

- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 3f252a73e81aa01660cb426735eab932e6182e8d`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < d35ac850410966010e92f401f4e21868a9ea4d8b`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < f3aac6cf390d8b80e1d82975faf4ac61175519c0`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 22f45cedf281e6171817c8a3432c44d788c550e1`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < d71abd1ae4e0413707cd42b10c24a11d1aa71772`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 74ad36ed60df561a303a19ecef400c7096b20306`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 36e83eda90e0e4ac52f259f775b40b2841f8a0a3`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1`
- `Linux >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f < 908e4ead7f757504d8b345452730636e298cbf68`
- `Linux 3.17`

## Remediation

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