CVE-2026-23265Public exploit

Crash via unchecked F2FS node footer

Published Mar 18, 2026 · Updated Mar 18, 2026

Improper validation in Linux Kernel F2FS allows local users to crash the kernel by writing back a corrupted filesystem image. The asynchronous f2fs_ra_node_pages() and f2fs_ra_node_page() paths load a node page without verifying that its footer nid matches the page index, and f2fs_write_end_io() later hits a kernel BUG when the dirty page is written back. Exploitation requires local privileges and an F2FS image with a corrupted node footer; the published impact is a system crash, not data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper validation in Linux Kernel F2FS allows local users to crash the kernel by writing back a corrupted filesystem image. The asynchronous f2fs_ra_node_pages() and f2fs_ra_node_page() paths load a node page without verifying that its footer nid matches the page index, and f2fs_write_end_io() later hits a kernel BUG when the dirty page is written back. Exploitation requires local privileges and an F2FS image with a corrupted node footer; the published impact is a system crash, not data disclosure or modification.

The record

CVE
CVE-2026-23265
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50ac3ecd8e05b6bcc350c71a4307d40c030ec7e4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <855c54f1803e3ebc613677b4f389c7f92656a1fc
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c386753db52b3a80afa6612bfdcb925aa5ca260f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <50ac3ecd8e05b6bcc350c71a4307d40c030ec7e4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <855c54f1803e3ebc613677b4f389c7f92656a1fc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c386753db52b3a80afa6612bfdcb925aa5ca260f

Published CVSS scores

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 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 exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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