CVE-2022-49414

Kernel crash via ext4 inline-data conversion race

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in the Linux kernel ext4 filesystem allows local users to crash the kernel through concurrent write and fallocate operations. ext4_convert_inline_data uses xattr_sem while generic_perform_write uses i_rwsem, allowing inline-data state to change between checks and leaving a null journal handle. Triggering the race requires write access to an ext4 inode with inline data and concurrent write and fallocate activity; the resulting metadata inconsistency reaches BUG_ON and interrupts the system.

CVSS severity4.7
Medium
EPSS probability0.19%
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 the Linux kernel ext4 filesystem allows local users to crash the kernel through concurrent write and fallocate operations. ext4_convert_inline_data uses xattr_sem while generic_perform_write uses i_rwsem, allowing inline-data state to change between checks and leaving a null journal handle. Triggering the race requires write access to an ext4 inode with inline data and concurrent write and fallocate activity; the resulting metadata inconsistency reaches BUG_ON and interrupts the system.

The record

CVE
CVE-2022-49414
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <14602353b350950b551eccc6b46411aa3b12ffe2
  2. Affected versionversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <18881d7e517169193d9ef6c89c7f322e3e164277
  3. Affected versionversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <725e00cb7039eae291890f1bb19bc867176745f6
  4. Affected versionversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <91f90b571f1a23f5b8a9c2b68a9aa5d6981a3c3d
  5. Affected versionversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <ccc6639f831bee91aa8b41c8a1cdd020ecfb9f32
  6. Affected versionversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <f87c7a4b084afc13190cbb263538e444cb2b392a
  7. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <14602353b350950b551eccc6b46411aa3b12ffe2; version=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <18881d7e517169193d9ef6c89c7f322e3e164277; version=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <725e00cb7039eae291890f1bb19bc867176745f6; version=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <91f90b571f1a23f5b8a9c2b68a9aa5d6981a3c3d; version=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <ccc6639f831bee91aa8b41c8a1cdd020ecfb9f32; version=0c8d414f163f5d35e43a4de7a6e5ee8c253fcccf <f87c7a4b084afc13190cbb263538e444cb2b392a; version=3.8

Published CVSS scores

4.7CISA ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CanonicalCVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
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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