CVE-2024-56780

Filesystem warning via unflushed quota workqueue race

Published Jan 8, 2025 · Updated May 23, 2026

A quota workqueue race in affected Linux kernel releases allows local users to trigger a kernel warning during filesystem freeze. The dquot_writeback_dquots() path leaves quota_release_work pending, so quota_release_workfn() later starts an ext4 transaction after the superblock is fully frozen. A local user must time pending releasing dquots against a filesystem freeze; the documented consequence is a WARN_ON and dmesg noise.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A quota workqueue race in affected Linux kernel releases allows local users to trigger a kernel warning during filesystem freeze. The dquot_writeback_dquots() path leaves quota_release_work pending, so quota_release_workfn() later starts an ext4 transaction after the superblock is fully frozen. A local user must time pending releasing dquots against a filesystem freeze; the documented consequence is a WARN_ON and dmesg noise.

The record

CVE
CVE-2024-56780
Published
Jan 8, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3027e200dd58d5b437f16634dbbd355b29ffe0a6 <3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb
  2. Affected versionversion=31bed65eecbc5ce57592cfe31947eaa64e3d678e
  3. Affected versionversion=4.19.295 <4.20
  4. Affected versionversion=5.10.195 <5.10.231
  5. Affected versionversion=5.15.132 <5.15.174
  6. Affected versionversion=5.4.257 <5.4.287
  7. Affected versionversion=6.1.53 <6.1.120
  8. Affected versionversion=6.4.16 <6.5
  9. Affected versionversion=6.5.3 <6.6
  10. Affected versionversion=6.6
  11. Affected versionversion=86d89987f0998c98f57d641e308b40452a994045 <6f3821acd7c3143145999248087de5fb4b48cf26
  12. Affected versionversion=89602de9a2d7080b7a4029d5c1bf8f78d295ff5f <ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
  13. Affected versionversion=903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0
  14. Affected versionversion=d40c192e119892799dd4ddf94f5cea6fa93775ef <a5abba5e0e586e258ded3e798fe5f69c66fec198
  15. Affected versionversion=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <8ea87e34792258825d290f4dc5216276e91cb224
  16. Affected versionversion=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <ac6f420291b3fee1113f21d612fa88b628afab5b
  17. Affected versionversion=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <bcacb52a985f1b6d280f698a470b873dfe52728a
  18. Affected versionversion=f3e9a2bbdeb8987508dd6bb2b701dea911d4daec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3027e200dd58d5b437f16634dbbd355b29ffe0a6 <3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb; version=31bed65eecbc5ce57592cfe31947eaa64e3d678e; version=4.19.295 <4.20; version=5.10.195 <5.10.231; version=5.15.132 <5.15.174; version=5.4.257 <5.4.287; version=6.1.53 <6.1.120; version=6.4.16 <6.5; version=6.5.3 <6.6; version=6.6; version=86d89987f0998c98f57d641e308b40452a994045 <6f3821acd7c3143145999248087de5fb4b48cf26; version=89602de9a2d7080b7a4029d5c1bf8f78d295ff5f <ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb; version=903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0; version=d40c192e119892799dd4ddf94f5cea6fa93775ef <a5abba5e0e586e258ded3e798fe5f69c66fec198; version=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <8ea87e34792258825d290f4dc5216276e91cb224; version=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <ac6f420291b3fee1113f21d612fa88b628afab5b; version=dabc8b20756601b9e1cc85a81d47d3f98ed4d13a <bcacb52a985f1b6d280f698a470b873dfe52728a; version=f3e9a2bbdeb8987508dd6bb2b701dea911d4daec

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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