CVE-2024-47740

LSM write bypass via atomic-write ioctls

Published Oct 21, 2024 · Updated Aug 5, 2026

Improper access control in affected Linux kernels allows local users to alter owned F2FS files despite LSM write restrictions. The atomic-write ioctl handlers rely on inode_owner_or_capable(), which accepts a matching FSUID without asking SELinux or Landlock to authorize write access. A local process must own the target inode and reach an F2FS mount; it can truncate the file to zero bytes or revert another process's concurrent changes.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Linux kernels allows local users to alter owned F2FS files despite LSM write restrictions. The atomic-write ioctl handlers rely on inode_owner_or_capable(), which accepts a matching FSUID without asking SELinux or Landlock to authorize write access. A local process must own the target inode and reach an F2FS mount; it can truncate the file to zero bytes or revert another process's concurrent changes.

The record

CVE
CVE-2024-47740
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1565.001
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=3.18
  2. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <000bab8753ae29a259feb339b99ee759795a48ac
  3. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <32f348ecc149e9ca70a1c424ae8fa9b6919d2713
  4. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <4583290898c13c2c2e5eb8773886d153c2c5121d
  5. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <4ce87674c3a6b4d3b3d45f85b584ab8618a3cece
  6. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <4f5a100f87f32cb65d4bb1ad282a08c92f6f591e
  7. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <5e0de753bfe87768ebe6744d869caa92f35e5731
  8. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653
  9. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <88ff021e1fea2d9b40b2d5efd9013c89f7be04ac
  10. Affected versionversion=88b88a66797159949cec32eaab12b4968f6fae2d <f3bfac2cabf5333506b263bc0c8497c95302f32d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=88b88a66797159949cec32eaab12b4968f6fae2d <000bab8753ae29a259feb339b99ee759795a48ac; version=88b88a66797159949cec32eaab12b4968f6fae2d <32f348ecc149e9ca70a1c424ae8fa9b6919d2713; version=88b88a66797159949cec32eaab12b4968f6fae2d <4583290898c13c2c2e5eb8773886d153c2c5121d; version=88b88a66797159949cec32eaab12b4968f6fae2d <4ce87674c3a6b4d3b3d45f85b584ab8618a3cece; version=88b88a66797159949cec32eaab12b4968f6fae2d <4f5a100f87f32cb65d4bb1ad282a08c92f6f591e; version=88b88a66797159949cec32eaab12b4968f6fae2d <5e0de753bfe87768ebe6744d869caa92f35e5731; version=88b88a66797159949cec32eaab12b4968f6fae2d <700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653; version=88b88a66797159949cec32eaab12b4968f6fae2d <88ff021e1fea2d9b40b2d5efd9013c89f7be04ac; version=88b88a66797159949cec32eaab12b4968f6fae2d <f3bfac2cabf5333506b263bc0c8497c95302f32d

Published CVSS scores

7.1Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
5.5NIST NVDCVSS: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

T1565.001Stored Data Manipulation

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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