---
id: CVE-2025-40196
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs: quota: create dedicated workqueue for quota_release_work

  There is a kernel panic due to WARN_ONCE when panic_on_warn is set.

  This issue occurs when writeback is t…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs: quota: create dedicated workqueue for quota_release_work

  There is a kernel panic due to WARN_ONCE when panic_on_warn is set.

  This issue occurs when writeback is t…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb <
    8df2eedd371a1c24ecc4283581299d7737dfcd06
  - >-
    Linux >= bcacb52a985f1b6d280f698a470b873dfe52728a <
    f846eacde280ecc3daedfe001580e3033565179e
  - >-
    Linux >= 8ea87e34792258825d290f4dc5216276e91cb224 <
    f12039df1515d5daf7d92e586ece5cefeb39561b
  - >-
    Linux >= ac6f420291b3fee1113f21d612fa88b628afab5b <
    8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0
  - >-
    Linux >= ac6f420291b3fee1113f21d612fa88b628afab5b <
    72b7ceca857f38a8ca7c5629feffc63769638974
  - Linux a5abba5e0e586e258ded3e798fe5f69c66fec198
  - Linux 6f3821acd7c3143145999248087de5fb4b48cf26
  - Linux ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
  - Linux >= 6.1.120 < 6.1.178
  - Linux >= 6.6.64 < 6.6.114
  - Linux >= 6.12.4 < 6.12.54
  - Linux >= 5.4.287 < 5.5
  - Linux >= 5.10.231 < 5.11
  - Linux >= 5.15.174 < 5.16
  - Linux 6.13
published: '2025-11-12'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T09:17:36.077'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40196'
references:
  - url: 'https://git.kernel.org/stable/c/72b7ceca857f38a8ca7c5629feffc63769638974'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8df2eedd371a1c24ecc4283581299d7737dfcd06'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f12039df1515d5daf7d92e586ece5cefeb39561b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f846eacde280ecc3daedfe001580e3033565179e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00193
epssPercentile: 0.0788
ingestedAt: '2026-07-24T15:30:58.029Z'
---

## Overview

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

fs: quota: create dedicated workqueue for quota_release_work

There is a kernel panic due to WARN_ONCE when panic_on_warn is set.

This issue occurs when writeback is triggered due to sync call for an
opened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance
is needed at sync path, flush for quota_release_work is triggered.
By default quota_release_work is queued to "events_unbound" queue which
does not have WQ_MEM_RECLAIM flag. During f2fs balance "writeback"
workqueue tries to flush quota_release_work causing kernel panic due to
MEM_RECLAIM flag mismatch errors.

This patch creates dedicated workqueue with WQ_MEM_RECLAIM flag
for work quota_release_work.

------------[ cut here ]------------
WARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148
Call trace:
 check_flush_dependency+0x13c/0x148
 __flush_work+0xd0/0x398
 flush_delayed_work+0x44/0x5c
 dquot_writeback_dquots+0x54/0x318
 f2fs_do_quota_sync+0xb8/0x1a8
 f2fs_write_checkpoint+0x3cc/0x99c
 f2fs_gc+0x190/0x750
 f2fs_balance_fs+0x110/0x168
 f2fs_write_single_data_page+0x474/0x7dc
 f2fs_write_data_pages+0x7d0/0xd0c
 do_writepages+0xe0/0x2f4
 __writeback_single_inode+0x44/0x4ac
 writeback_sb_inodes+0x30c/0x538
 wb_writeback+0xf4/0x440
 wb_workfn+0x128/0x5d4
 process_scheduled_works+0x1c4/0x45c
 worker_thread+0x32c/0x3e8
 kthread+0x11c/0x1b0
 ret_from_fork+0x10/0x20
Kernel panic - not syncing: kernel: panic_on_warn set ...

## Remediation

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