---
id: CVE-2024-56780
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  quota: flush quota_release_work upon quota writeback

  One of the paths quota writeback is called from is:

  freeze_super()
    sync_filesystem()
      ext4_sync_fs()
        d…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  quota: flush quota_release_work upon quota writeback

  One of the paths quota writeback is called from is:

  freeze_super()
    sync_filesystem()
      ext4_sync_fs()
        d…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.19.295, < 4.20'
  - 'linux_kernel >= 5.4.257, < 5.4.287'
  - 'linux_kernel >= 5.10.195, < 5.10.231'
  - 'linux_kernel >= 5.15.132, < 5.15.174'
  - 'linux_kernel >= 6.1.53, < 6.1.120'
  - 'linux_kernel >= 6.4.16, < 6.5'
  - 'linux_kernel >= 6.5.3, < 6.6.64'
  - 'linux_kernel >= 6.7, < 6.12.4'
  - linux_kernel = 6.13
patched:
  - linux_kernel 6.12.4
published: '2025-01-08'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:17:11.373'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-56780'
references:
  - url: 'https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00217
epssPercentile: 0.12117
ingestedAt: '2026-10-15T03:30:12.777Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T19:56:25.354258Z'
---

## Overview

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

quota: flush quota_release_work upon quota writeback

One of the paths quota writeback is called from is:

freeze_super()
  sync_filesystem()
    ext4_sync_fs()
      dquot_writeback_dquots()

Since we currently don't always flush the quota_release_work queue in
this path, we can end up with the following race:

 1. dquot are added to releasing_dquots list during regular operations.
 2. FS Freeze starts, however, this does not flush the quota_release_work queue.
 3. Freeze completes.
 4. Kernel eventually tries to flush the workqueue while FS is frozen which
    hits a WARN_ON since transaction gets started during frozen state:

  ext4_journal_check_start+0x28/0x110 [ext4] (unreliable)
  __ext4_journal_start_sb+0x64/0x1c0 [ext4]
  ext4_release_dquot+0x90/0x1d0 [ext4]
  quota_release_workfn+0x43c/0x4d0

Which is the following line:

  WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);

Which ultimately results in generic/390 failing due to dmesg
noise. This was detected on powerpc machine 15 cores.

To avoid this, make sure to flush the workqueue during
dquot_writeback_dquots() so we dont have any pending workitems after
freeze.

## Affected

- `linux_kernel >= 4.19.295, < 4.20`
- `linux_kernel >= 5.4.257, < 5.4.287`
- `linux_kernel >= 5.10.195, < 5.10.231`
- `linux_kernel >= 5.15.132, < 5.15.174`
- `linux_kernel >= 6.1.53, < 6.1.120`
- `linux_kernel >= 6.4.16, < 6.5`
- `linux_kernel >= 6.5.3, < 6.6.64`
- `linux_kernel >= 6.7, < 6.12.4`
- `linux_kernel = 6.13`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.12.4`