CVE-2023-52640Public exploit

Kernel memory disclosure via unchecked xattr length

Published Apr 3, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux kernel ntfs3 driver allows local users to read kernel memory or crash the system via crafted NTFS metadata. ntfs_list_ea trusts an extended-attribute name_len value and copies that many bytes even when the name exceeds the remaining EA record space. Exploitation requires local access to invoke listxattr on an NTFS3 filesystem containing the malformed metadata; no integrity impact is reported.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel ntfs3 driver allows local users to read kernel memory or crash the system via crafted NTFS metadata. ntfs_list_ea trusts an extended-attribute name_len value and copies that many bytes even when the name exceeds the remaining EA record space. Exploitation requires local access to invoke listxattr on an NTFS3 filesystem containing the malformed metadata; no integrity impact is reported.

The record

CVE
CVE-2023-52640
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <0830c5cf19bdec50d0ede4755ddc463663deb21c
  2. Affected versionversion=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <52fff5799e3d1b5803ecd2f5f19c13c65f4f7b23
  3. Affected versionversion=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <6ed6cdbe88334ca3430c5aee7754dc4597498dfb
  4. Affected versionversion=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <731ab1f9828800df871c5a7ab9ffe965317d3f15
  5. Affected versionversion=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <a585faf0591548fe0920641950ebfa8a6eefe1cd
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <0830c5cf19bdec50d0ede4755ddc463663deb21c; version=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <52fff5799e3d1b5803ecd2f5f19c13c65f4f7b23; version=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <6ed6cdbe88334ca3430c5aee7754dc4597498dfb; version=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <731ab1f9828800df871c5a7ab9ffe965317d3f15; version=4534a70b7056fd4b9a1c6db5a4ce3c98546b291e <a585faf0591548fe0920641950ebfa8a6eefe1cd; version=5.15

Published CVSS scores

7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index

Public exploit references

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Technologies

Your stack

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Your stack

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