CVE-2023-53270

Local service interruption via ext4 size inconsistency

Published Sep 16, 2025 · Updated Sep 16, 2025

Availability flaw in the Linux ext4 write path allows local users to trigger a kernel Oops and interrupt service via partial writes. ext4_da_write_end updates i_disksize from the initial copied-byte count before block_write_end can reduce copied to zero, leaving i_disksize greater than i_size. Triggering the Oops requires local low-privileged write access to an ext4 filesystem, a partial buffered write, and a subsequent unaligned direct-I/O write.

CVSS severity5.5
Medium
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

Availability flaw in the Linux ext4 write path allows local users to trigger a kernel Oops and interrupt service via partial writes. ext4_da_write_end updates i_disksize from the initial copied-byte count before block_write_end can reduce copied to zero, leaving i_disksize greater than i_size. Triggering the Oops requires local low-privileged write access to an ext4 filesystem, a partial buffered write, and a subsequent unaligned direct-I/O write.

The record

CVE
CVE-2023-53270
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=2.6.27
  2. Affected versionversion=64769240bd07f446f83660bb143bb609d8ab4910 <18eb23891aeae3229baf8c7c23b76be3364e1967
  3. Affected versionversion=64769240bd07f446f83660bb143bb609d8ab4910 <1dedde690303c05ef732b7c5c8356fdf60a4ade3
  4. Affected versionversion=64769240bd07f446f83660bb143bb609d8ab4910 <3ecea2fee14227712694c8b54ad99d471e61de92
  5. Affected versionversion=64769240bd07f446f83660bb143bb609d8ab4910 <53877ed201baa6b58f7ce9df92664a839113c30e
  6. Affected versionversion=64769240bd07f446f83660bb143bb609d8ab4910 <d30090eb546d993ea3f3023452540c476ea614a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=64769240bd07f446f83660bb143bb609d8ab4910 <18eb23891aeae3229baf8c7c23b76be3364e1967; version=64769240bd07f446f83660bb143bb609d8ab4910 <1dedde690303c05ef732b7c5c8356fdf60a4ade3; version=64769240bd07f446f83660bb143bb609d8ab4910 <3ecea2fee14227712694c8b54ad99d471e61de92; version=64769240bd07f446f83660bb143bb609d8ab4910 <53877ed201baa6b58f7ce9df92664a839113c30e; version=64769240bd07f446f83660bb143bb609d8ab4910 <d30090eb546d993ea3f3023452540c476ea614a5

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

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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

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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