---
id: CVE-2023-53450
title: 'ext4: remove a BUG_ON in ext4_mb_release_group_pa()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ext4: remove a BUG_ON in ext4_mb_release_group_pa()

  If a malicious fuzzer overwrites the ext4 superblock while it is
  mounted such that the s_first_data_block is set to…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    ef16d8a1798db1a1604ac44ca1bd73ec6bebf483
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    185062a21976fbc38f2efd296951b02c4500cf65
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    b0fc279de4bf17e1710bb7e83906538ff8f11111
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    978e5e9111af18741449b81fefd531a622dd969a
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    d87a4e4094c9879fc8acdff8ce59fdffa979c8e0
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    bf2a16eb4e6d06124bd8436d4546f61539a65f29
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    53c14e7cc2257191ba15425c15638fc4f8abb92b
  - >-
    Linux >= c9de560ded61faa5b754137b7753da252391c55a <
    463808f237cf73e98a1a45ff7460c2406a150a0b
  - Linux 2.6.25
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:20:53.399256Z'
published: '2025-10-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:09.229Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53450'
references:
  - url: 'https://git.kernel.org/stable/c/d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b'
  - url: 'https://git.kernel.org/stable/c/ef16d8a1798db1a1604ac44ca1bd73ec6bebf483'
  - url: 'https://git.kernel.org/stable/c/185062a21976fbc38f2efd296951b02c4500cf65'
  - url: 'https://git.kernel.org/stable/c/b0fc279de4bf17e1710bb7e83906538ff8f11111'
  - url: 'https://git.kernel.org/stable/c/978e5e9111af18741449b81fefd531a622dd969a'
  - url: 'https://git.kernel.org/stable/c/d87a4e4094c9879fc8acdff8ce59fdffa979c8e0'
  - url: 'https://git.kernel.org/stable/c/bf2a16eb4e6d06124bd8436d4546f61539a65f29'
  - url: 'https://git.kernel.org/stable/c/53c14e7cc2257191ba15425c15638fc4f8abb92b'
  - url: 'https://git.kernel.org/stable/c/463808f237cf73e98a1a45ff7460c2406a150a0b'
tags:
  - cve.org
epss: 0.00163
epssPercentile: 0.05561
ingestedAt: '2026-11-05T22:38:31.795Z'
---

## Overview

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

ext4: remove a BUG_ON in ext4_mb_release_group_pa()

If a malicious fuzzer overwrites the ext4 superblock while it is
mounted such that the s_first_data_block is set to a very large
number, the calculation of the block group can underflow, and trigger
a BUG_ON check.  Change this to be an ext4_warning so that we don't
crash the kernel.

## Affected

- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < ef16d8a1798db1a1604ac44ca1bd73ec6bebf483`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < 185062a21976fbc38f2efd296951b02c4500cf65`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < b0fc279de4bf17e1710bb7e83906538ff8f11111`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < 978e5e9111af18741449b81fefd531a622dd969a`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < d87a4e4094c9879fc8acdff8ce59fdffa979c8e0`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < bf2a16eb4e6d06124bd8436d4546f61539a65f29`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < 53c14e7cc2257191ba15425c15638fc4f8abb92b`
- `Linux >= c9de560ded61faa5b754137b7753da252391c55a < 463808f237cf73e98a1a45ff7460c2406a150a0b`
- `Linux 2.6.25`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.