CVE-2024-40969

Privileged filesystem shutdown hang via readonly transition

Published Jul 12, 2024 · Updated May 11, 2026

Denial of service in Linux kernel F2FS allows local users to hang filesystem shutdown through a crafted full-sync shutdown ioctl. The f2fs_ioc_shutdown path freezes the block device, but f2fs_stop_checkpoint can mark the superblock read-only; thaw_super then returns EINVAL while the discard thread and shutdown caller wait on each other. Reaching the faulty path requires CAP_SYS_ADMIN and an F2FS volume in a critical-error state; the resulting deadlock interrupts filesystem shutdown.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel F2FS allows local users to hang filesystem shutdown through a crafted full-sync shutdown ioctl. The f2fs_ioc_shutdown path freezes the block device, but f2fs_stop_checkpoint can mark the superblock read-only; thaw_super then returns EINVAL while the discard thread and shutdown caller wait on each other. Reaching the faulty path requires CAP_SYS_ADMIN and an F2FS volume in a critical-error state; the resulting deadlock interrupts filesystem shutdown.

The record

CVE
CVE-2024-40969
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 12, 2024CVE 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=3.8
  2. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <1036d3ea7a32cb7cee00885c73a1f2ba7fbc499a
  3. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <3bdb7f161697e2d5123b89fe1778ef17a44858e7
  4. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <f47ed3b284b38f235355e281f57dfa8fffcc6563

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <1036d3ea7a32cb7cee00885c73a1f2ba7fbc499a; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <3bdb7f161697e2d5123b89fe1778ef17a44858e7; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <f47ed3b284b38f235355e281f57dfa8fffcc6563

Published CVSS scores

5.5NVDCVSS: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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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