CVE-2023-52631

Local kernel crash via allocation-size overflow

Published Apr 2, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux NTFS3 driver allows local users to crash a 32-bit kernel via a crafted NTFS attribute list. In ntfs_load_attr_list(), adding 1023 to the resident data_size can wrap to zero, so kmalloc returns ZERO_SIZE_PTR and the following memcpy causes an Oops. Exploitation requires local low-privileged access, a 32-bit kernel, and NTFS3 processing of the crafted metadata; the bounded impact is service interruption.

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

NULL pointer dereference in the Linux NTFS3 driver allows local users to crash a 32-bit kernel via a crafted NTFS attribute list. In ntfs_load_attr_list(), adding 1023 to the resident data_size can wrap to zero, so kmalloc returns ZERO_SIZE_PTR and the following memcpy causes an Oops. Exploitation requires local low-privileged access, a 32-bit kernel, and NTFS3 processing of the crafted metadata; the bounded impact is service interruption.

The record

CVE
CVE-2023-52631
Published
Apr 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 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=5.15
  2. Affected versionversion=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <686820fe141ea0220fc6fdfc7e5694f915cf64b2
  3. Affected versionversion=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b
  4. Affected versionversion=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <b2dd7b953c25ffd5912dda17e980e7168bebcf6c
  5. Affected versionversion=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <ec1bedd797588fe38fc11cba26d77bb1d9b194c6
  6. Affected versionversion=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <fb7bcd1722bc9bc55160378f5f99c01198fd14a7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <686820fe141ea0220fc6fdfc7e5694f915cf64b2; version=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b; version=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <b2dd7b953c25ffd5912dda17e980e7168bebcf6c; version=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <ec1bedd797588fe38fc11cba26d77bb1d9b194c6; version=be71b5cba2e6485e8959da7a9f9a44461a1bb074 <fb7bcd1722bc9bc55160378f5f99c01198fd14a7

Published CVSS scores

5.5CISA ADPCVSS: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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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