---
id: CVE-2025-38393
title: 'NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN

  We found a few different systems hung up in writeback waiting on the same
  page lock, and one task waiting on the NFS…
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8acc3e228e1c90bd410f73597a4549e0409f22d6 <
    08287df60bac5b008b6bcdb03053988335d3d282
  - >-
    Linux >= ec23a86e060cbe30b62eb2955adc97c92d80cc4c <
    8846fd02c98da8b79e6343a20e6071be6f372180
  - >-
    Linux >= 880265c77ac415090090d1fe72a188fee71cb458 <
    e4b13885e7ef1e64e45268feef1e5f0707c47e72
  - >-
    Linux >= 880265c77ac415090090d1fe72a188fee71cb458 <
    8ca65fa71024a1767a59ffbc6a6e2278af84735e
  - >-
    Linux >= 880265c77ac415090090d1fe72a188fee71cb458 <
    864a54c1243ed3ca60baa4bc492dede1361f4c83
  - >-
    Linux >= 880265c77ac415090090d1fe72a188fee71cb458 <
    1f4da20080718f258e189a2c5f515385fa393da6
  - >-
    Linux >= 880265c77ac415090090d1fe72a188fee71cb458 <
    c01776287414ca43412d1319d2877cbad65444ac
  - Linux f133819e24e78f3aaaa00e9fa2b816d5f73fd172
  - Linux >= 5.10.124 < 5.10.240
  - Linux >= 5.15.49 < 5.15.187
  - Linux >= 5.18.6 < 5.19
  - Linux 5.19
published: '2025-07-25'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:07:11.236Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38393'
references:
  - url: 'https://git.kernel.org/stable/c/08287df60bac5b008b6bcdb03053988335d3d282'
  - url: 'https://git.kernel.org/stable/c/8846fd02c98da8b79e6343a20e6071be6f372180'
  - url: 'https://git.kernel.org/stable/c/e4b13885e7ef1e64e45268feef1e5f0707c47e72'
  - url: 'https://git.kernel.org/stable/c/8ca65fa71024a1767a59ffbc6a6e2278af84735e'
  - url: 'https://git.kernel.org/stable/c/864a54c1243ed3ca60baa4bc492dede1361f4c83'
  - url: 'https://git.kernel.org/stable/c/1f4da20080718f258e189a2c5f515385fa393da6'
  - url: 'https://git.kernel.org/stable/c/c01776287414ca43412d1319d2877cbad65444ac'
tags:
  - cve.org
epss: 0.00405
epssPercentile: 0.34567
ingestedAt: '2026-10-15T05:52:46.090Z'
---

## Overview

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

NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN

We found a few different systems hung up in writeback waiting on the same
page lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in
pnfs_update_layout(), however the pnfs_layout_hdr's plh_outstanding count
was zero.

It seems most likely that this is another race between the waiter and waker
similar to commit ed0172af5d6f ("SUNRPC: Fix a race to wake a sync task").
Fix it up by applying the advised barrier.

## Affected

- `Linux >= 8acc3e228e1c90bd410f73597a4549e0409f22d6 < 08287df60bac5b008b6bcdb03053988335d3d282`
- `Linux >= ec23a86e060cbe30b62eb2955adc97c92d80cc4c < 8846fd02c98da8b79e6343a20e6071be6f372180`
- `Linux >= 880265c77ac415090090d1fe72a188fee71cb458 < e4b13885e7ef1e64e45268feef1e5f0707c47e72`
- `Linux >= 880265c77ac415090090d1fe72a188fee71cb458 < 8ca65fa71024a1767a59ffbc6a6e2278af84735e`
- `Linux >= 880265c77ac415090090d1fe72a188fee71cb458 < 864a54c1243ed3ca60baa4bc492dede1361f4c83`
- `Linux >= 880265c77ac415090090d1fe72a188fee71cb458 < 1f4da20080718f258e189a2c5f515385fa393da6`
- `Linux >= 880265c77ac415090090d1fe72a188fee71cb458 < c01776287414ca43412d1319d2877cbad65444ac`
- `Linux f133819e24e78f3aaaa00e9fa2b816d5f73fd172`
- `Linux >= 5.10.124 < 5.10.240`
- `Linux >= 5.15.49 < 5.15.187`
- `Linux >= 5.18.6 < 5.19`
- `Linux 5.19`

## Remediation

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