CVE-2024-36027

Filesystem corruption via non-dirty buffer zeroing

Published May 30, 2024 · Updated Aug 5, 2026

Race condition in Btrfs zoned mode in Linux 6.8 allows local users to corrupt filesystem metadata during extent-buffer writeback. btrfs_clear_buffer_dirty() sets EXTENT_BUFFER_ZONED_ZEROOUT on a buffer with WRITEBACK set but DIRTY clear, so submission can erase its contents. Exploitation requires Btrfs zoned mode and precise writeback timing; it can cause an EUCLEAN transaction abort or write a cleared tree node to disk.

CVSS severity7.1
High
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

Race condition in Btrfs zoned mode in Linux 6.8 allows local users to corrupt filesystem metadata during extent-buffer writeback. btrfs_clear_buffer_dirty() sets EXTENT_BUFFER_ZONED_ZEROOUT on a buffer with WRITEBACK set but DIRTY clear, so submission can erase its contents. Exploitation requires Btrfs zoned mode and precise writeback timing; it can cause an EUCLEAN transaction abort or write a cleared tree node to disk.

The record

CVE
CVE-2024-36027
Published
May 30, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.8
  2. Affected versionversion=aa6313e6ff2bfbf736a2739047bba355d8241584 <68879386180c0efd5a11e800b0525a01068c9457
  3. Affected versionversion=aa6313e6ff2bfbf736a2739047bba355d8241584 <f4b994fccbb6f294c4b31a6ca0114b09f7245043

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=aa6313e6ff2bfbf736a2739047bba355d8241584 <68879386180c0efd5a11e800b0525a01068c9457; version=aa6313e6ff2bfbf736a2739047bba355d8241584 <f4b994fccbb6f294c4b31a6ca0114b09f7245043

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499Endpoint Denial of Service

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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