CVE-2023-2898

Privileged local crash via stale F2FS inode

Published May 26, 2023 · Updated Oct 15, 2024

NULL pointer dereference in Linux kernel F2FS allows local users with filesystem administration privileges to crash the system. A resize/remount race can leave dirty metadata for writeback after f2fs_put_super clears node_inode, so f2fs_write_end_io dereferences the cleared pointer. Triggering the crash requires privileges to issue F2FS_IOC_RESIZE_FS and race a read-only remount; the demonstrated consequence is a kernel panic and service interruption.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel F2FS allows local users with filesystem administration privileges to crash the system. A resize/remount race can leave dirty metadata for writeback after f2fs_put_super clears node_inode, so f2fs_write_end_io dereferences the cleared pointer. Triggering the crash requires privileges to issue F2FS_IOC_RESIZE_FS and race a read-only remount; the demonstrated consequence is a kernel panic and service interruption.

The record

CVE
CVE-2023-2898
Published
May 26, 2023
Updated
Oct 15, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=NA

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=NA

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7NIST NVDCVSS: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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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