CVE-2024-37354

Kernel crash via overlapping preallocated extents

Published Jun 25, 2024 · Updated Aug 5, 2026

A Btrfs race in Linux allows local users with filesystem write access to crash the kernel during concurrent fsync and direct I/O. btrfs_log_prealloc_extents unlocks its tree path in btrfs_next_leaf and then copies a newly inserted preallocated extent without excluding an extent already copied to the log. Triggering requires a writable Btrfs file and a race with a size-extending direct-I/O write; duplicate extent keys reach BUG() and interrupt the host.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A Btrfs race in Linux allows local users with filesystem write access to crash the kernel during concurrent fsync and direct I/O. btrfs_log_prealloc_extents unlocks its tree path in btrfs_next_leaf and then copies a newly inserted preallocated extent without excluding an extent already copied to the log. Triggering requires a writable Btrfs file and a race with a size-extending direct-I/O write; duplicate extent keys reach BUG() and interrupt the host.

The record

CVE
CVE-2024-37354
Published
Jun 25, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 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=31d11b83b96faaee4bb514d375a09489117c3e8d <1ff2bd566fbcefcb892be85c493bdb92b911c428
  2. Affected versionversion=31d11b83b96faaee4bb514d375a09489117c3e8d <3d08c52ba1887a1ff9c179d4b6a18b427bcb2097
  3. Affected versionversion=31d11b83b96faaee4bb514d375a09489117c3e8d <9d274c19a71b3a276949933859610721a453946b
  4. Affected versionversion=31d11b83b96faaee4bb514d375a09489117c3e8d <c993fd02ba471e296ca1996f13626fc917120158
  5. Affected versionversion=31d11b83b96faaee4bb514d375a09489117c3e8d <f4e5ed974876c14d3623e04dc43d3e3281bc6011
  6. Affected versionversion=4.14.57 <4.15
  7. Affected versionversion=4.17
  8. Affected versionversion=61a9f6b7fe0ca9706b49a23cecf5f9a9c802b6ce

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=31d11b83b96faaee4bb514d375a09489117c3e8d <1ff2bd566fbcefcb892be85c493bdb92b911c428; version=31d11b83b96faaee4bb514d375a09489117c3e8d <3d08c52ba1887a1ff9c179d4b6a18b427bcb2097; version=31d11b83b96faaee4bb514d375a09489117c3e8d <9d274c19a71b3a276949933859610721a453946b; version=31d11b83b96faaee4bb514d375a09489117c3e8d <c993fd02ba471e296ca1996f13626fc917120158; version=31d11b83b96faaee4bb514d375a09489117c3e8d <f4e5ed974876c14d3623e04dc43d3e3281bc6011; version=4.14.57 <4.15; version=4.17; version=61a9f6b7fe0ca9706b49a23cecf5f9a9c802b6ce

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application 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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