---
id: CVE-2023-53506
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  udf: Do not bother merging very long extents

  When merging very long extents we try to push as much length as possible
  to the first extent
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  udf: Do not bother merging very long extents

  When merging very long extents we try to push as much length as possible
  to the first extent. However this is unnecessaril…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.12.1, < 4.14.308'
  - 'linux_kernel >= 4.15, < 4.19.276'
  - 'linux_kernel >= 4.20, < 5.4.235'
  - 'linux_kernel >= 5.5, < 5.10.173'
  - 'linux_kernel >= 5.11, < 5.15.99'
  - 'linux_kernel >= 5.16, < 6.1.16'
  - 'linux_kernel >= 6.2, < 6.2.3'
  - linux_kernel = 2.6.12
patched:
  - linux_kernel 6.2.3
published: '2025-10-01'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:17:41.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-53506'
references:
  - url: 'https://git.kernel.org/stable/c/3d20e3b768aff32112bdce8d3219d923ae75f9f1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/53cafe1d6d8ef9f93318e5bfccc0d24f27d41ced'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d029799d381a9ee06209a222cae75f04c5d5304'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7a965da79f2d22601f329cbfce588386b0847544'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/965982feb333aefa9256c0fe188b5f1b958aef63'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9a8d602f0723586e668bae7e65c832ceb9bcc8bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/adac9ac6d2e04ea0782b91a00ba10706002f3ec4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d52252a1de4cf96a34f722b0cd8902d8ff78eb57'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00168
epssPercentile: 0.06121
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:35:12.111936Z'
ingestedAt: '2026-10-15T22:48:25.406Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

udf: Do not bother merging very long extents

When merging very long extents we try to push as much length as possible
to the first extent. However this is unnecessarily complicated and not
really worth the trouble. Furthermore there was a bug in the logic
resulting in corrupting extents in the file as syzbot reproducer shows.
So just don't bother with the merging of extents that are too long
together.

## Affected

- `linux_kernel >= 2.6.12.1, < 4.14.308`
- `linux_kernel >= 4.15, < 4.19.276`
- `linux_kernel >= 4.20, < 5.4.235`
- `linux_kernel >= 5.5, < 5.10.173`
- `linux_kernel >= 5.11, < 5.15.99`
- `linux_kernel >= 5.16, < 6.1.16`
- `linux_kernel >= 6.2, < 6.2.3`
- `linux_kernel = 2.6.12`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.2.3`