CVE-2024-47740· NVD / CVE Program· CNA Linux

f2fs: Require FMODE_WRITE for atomic write ioctls

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 000bab8753ae29a259feb339b99ee759795a48ac, 32f348ecc149e9ca70a1c424ae8fa9b6919d2713, 4583290898c13c2c2e5eb8773886d153c2c5121d.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 000bab8753ae29a259feb339b99ee759795a48ac, 32f348ecc149e9ca70a1c424ae8fa9b6919d2713, 4583290898c13c2c2e5eb8773886d153c2c5121d or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2025-03386

Published: Oct 21, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 13th percentile
CWE: —

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.5
CNA · Linux: 7.1; 1.6 point gap

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel3.18 and later · before 4.19.323
linux linux kernel4.20 and later · before 5.4.285
linux linux kernel5.5 and later · before 5.10.227
linux linux kernel5.11 and later · before 5.15.168
linux linux kernel5.16 and later · before 6.1.113
linux linux kernel6.2 and later · before 6.6.54
linux linux kernel6.7 and later · before 6.10.13
linux linux kernel6.11 and later · before 6.11.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 3.18affected
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653affected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 4ce87674c3a6b4d3b3d45f85b584ab8618a3ceceaffected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 000bab8753ae29a259feb339b99ee759795a48acaffected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 88ff021e1fea2d9b40b2d5efd9013c89f7be04acaffected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 32f348ecc149e9ca70a1c424ae8fa9b6919d2713affected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 5e0de753bfe87768ebe6744d869caa92f35e5731affected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before f3bfac2cabf5333506b263bc0c8497c95302f32daffected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 4583290898c13c2c2e5eb8773886d153c2c5121daffected · git
- 88b88a66797159949cec32eaab12b4968f6fae2d and later · before 4f5a100f87f32cb65d4bb1ad282a08c92f6f591eaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.115-1	6.1.115-1
Debian:13	linux	before 6.11.2-1	6.11.2-1

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	000bab8753ae29a259feb339b99ee759795a48ac	Vendor (CNA)
Linux Linux	32f348ecc149e9ca70a1c424ae8fa9b6919d2713	Vendor (CNA)
Linux Linux	4583290898c13c2c2e5eb8773886d153c2c5121d	Vendor (CNA)
Linux Linux	4ce87674c3a6b4d3b3d45f85b584ab8618a3cece	Vendor (CNA)
Linux Linux	4f5a100f87f32cb65d4bb1ad282a08c92f6f591e	Vendor (CNA)
Linux Linux	5e0de753bfe87768ebe6744d869caa92f35e5731	Vendor (CNA)
Linux Linux	700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653	Vendor (CNA)
Linux Linux	88ff021e1fea2d9b40b2d5efd9013c89f7be04ac	Vendor (CNA)
Linux Linux	f3bfac2cabf5333506b263bc0c8497c95302f32d	Vendor (CNA)
debian:linux	6.1.115-1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-1743 · Oct 22, 2024(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records