CVE-2024-49859

Data exposure and corruption via atomic-write ioctl race

Published Oct 21, 2024 · Updated Aug 5, 2026

Race condition in the Linux F2FS ioctl implementation allows local users to expose or corrupt file data and crash the kernel. f2fs_defragment_range, f2fs_move_file_range, and f2fs_ioc_set_pin_file fail to reject inodes already in atomic-write mode before performing defragmentation, range moves, or pin changes. Exploitation requires low-privilege local access to an F2FS file and winning the conflicting-operation race; no user interaction is required.

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

Race condition in the Linux F2FS ioctl implementation allows local users to expose or corrupt file data and crash the kernel. f2fs_defragment_range, f2fs_move_file_range, and f2fs_ioc_set_pin_file fail to reject inodes already in atomic-write mode before performing defragmentation, range moves, or pin changes. Exploitation requires low-privilege local access to an F2FS file and winning the conflicting-operation race; no user interaction is required.

The record

CVE
CVE-2024-49859
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=3.8
  2. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <10569b682ebe9c75ef06ddd322ae844e9be6374b
  3. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <26b07bd2e1f124b0e430c8d250023f7205c549c3
  4. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <7cb51731f24b216b0b87942f519f2c67a17107ee
  5. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <bfe5c02654261bfb8bd9cb174a67f3279ea99e58
  6. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <d6f08c88047accc6127dddb6798a3ff11321539d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <10569b682ebe9c75ef06ddd322ae844e9be6374b; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <26b07bd2e1f124b0e430c8d250023f7205c549c3; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <7cb51731f24b216b0b87942f519f2c67a17107ee; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <bfe5c02654261bfb8bd9cb174a67f3279ea99e58; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <d6f08c88047accc6127dddb6798a3ff11321539d

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 National Vulnerability DatabaseCVSS: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.

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

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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