CVE-2023-53692

Memory disclosure and corruption via stale inline data

Published Oct 22, 2025 · Updated Oct 22, 2025

Use-after-free in the Linux ext4 extent lookup allows local users to disclose memory or corrupt data through ordinary file writes. ext4_clu_mapped can treat stale inline i_data as an extent root after inline-to-extent conversion, so ext4_find_extent reads freed or out-of-bounds heap data as attacker-controlled mappings. The trigger requires write access to a mounted ext4 filesystem created with both bigalloc and inline_data; it can expose kernel or cross-file data, corrupt files or metadata, or crash the kernel.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux ext4 extent lookup allows local users to disclose memory or corrupt data through ordinary file writes. ext4_clu_mapped can treat stale inline i_data as an extent root after inline-to-extent conversion, so ext4_find_extent reads freed or out-of-bounds heap data as attacker-controlled mappings. The trigger requires write access to a mounted ext4 filesystem created with both bigalloc and inline_data; it can expose kernel or cross-file data, corrupt files or metadata, or crash the kernel.

The record

CVE
CVE-2023-53692
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record 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=131294c35ed6f777bd4e79d42af13b5c41bf2775 <11c87c8df2cae1d6be83c07e59fef0792de73482
  2. Affected versionversion=131294c35ed6f777bd4e79d42af13b5c41bf2775 <14da044725a3ab10affa3566d29c15737c0e67a4
  3. Affected versionversion=131294c35ed6f777bd4e79d42af13b5c41bf2775 <835659598c67907b98cd2aa57bb951dfaf675c69
  4. Affected versionversion=6.2
  5. Affected versionversion=6f4200ec76a0d31200c308ec5a71c68df5417004 <a34f6dcb78c654ab905642c1b4e7e5fbb4f0babe
  6. Affected versionversion=81b915181c630ee1cffa052e52874fe4e1ba91ac <96d440bee177669dc0acedca0abd73bae6a9be8b
  7. Affected versionversion=9404839e0c9db5a517ea83c0ca3388b39d105fdf <770b0613637f59f3091dda1ff0c23671a5326b9c
  8. Affected versionversion=c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193
  9. Affected versionversion=d440d6427a5e3a877c1c259b8d2b216ddb65e185 <40566def189c513be2c694681256d7486cc6e368

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=131294c35ed6f777bd4e79d42af13b5c41bf2775 <11c87c8df2cae1d6be83c07e59fef0792de73482; version=131294c35ed6f777bd4e79d42af13b5c41bf2775 <14da044725a3ab10affa3566d29c15737c0e67a4; version=131294c35ed6f777bd4e79d42af13b5c41bf2775 <835659598c67907b98cd2aa57bb951dfaf675c69; version=6.2; version=6f4200ec76a0d31200c308ec5a71c68df5417004 <a34f6dcb78c654ab905642c1b4e7e5fbb4f0babe; version=81b915181c630ee1cffa052e52874fe4e1ba91ac <96d440bee177669dc0acedca0abd73bae6a9be8b; version=9404839e0c9db5a517ea83c0ca3388b39d105fdf <770b0613637f59f3091dda1ff0c23671a5326b9c; version=c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193; version=d440d6427a5e3a877c1c259b8d2b216ddb65e185 <40566def189c513be2c694681256d7486cc6e368

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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