---
id: CVE-2023-53457
title: 'FS: JFS: Fix null-ptr-deref Read in txBegin'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  FS: JFS: Fix null-ptr-deref Read in txBegin

   Syzkaller reported an issue where txBegin may be called
   on a superblock in a read-only mounted filesystem which leads
   to…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a7225e9e09519deb7e0c42eb6070029cc456e84d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    1b4c144767736221cad92c132f72b3c6ed06a0ea
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a7d17d6bd7cd4f6940b335ea7a6fce5b6d22adc2
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    2a3f20efe6c901d4c0871cfd1d8c65e2ade71fc1
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3e94d0d378d2754b26fc54b429582553f7b53e15
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3e5eb6c5ecd8ddb9cfea751cf30f9e23eac97ca3
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    fd2db13fb72ff18c633a48229589d42ceb89d1f8
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    47cfdc338d674d38f4b2f22b7612cc6a2763ba27
  - Linux 2.6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:21:14.593104Z'
published: '2025-10-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:09.819Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53457'
references:
  - url: 'https://git.kernel.org/stable/c/a7225e9e09519deb7e0c42eb6070029cc456e84d'
  - url: 'https://git.kernel.org/stable/c/1b4c144767736221cad92c132f72b3c6ed06a0ea'
  - url: 'https://git.kernel.org/stable/c/a7d17d6bd7cd4f6940b335ea7a6fce5b6d22adc2'
  - url: 'https://git.kernel.org/stable/c/2a3f20efe6c901d4c0871cfd1d8c65e2ade71fc1'
  - url: 'https://git.kernel.org/stable/c/3e94d0d378d2754b26fc54b429582553f7b53e15'
  - url: 'https://git.kernel.org/stable/c/3e5eb6c5ecd8ddb9cfea751cf30f9e23eac97ca3'
  - url: 'https://git.kernel.org/stable/c/fd2db13fb72ff18c633a48229589d42ceb89d1f8'
  - url: 'https://git.kernel.org/stable/c/47cfdc338d674d38f4b2f22b7612cc6a2763ba27'
tags:
  - cve.org
epss: 0.0016
epssPercentile: 0.05154
ingestedAt: '2026-11-05T22:38:31.797Z'
---

## Overview

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

FS: JFS: Fix null-ptr-deref Read in txBegin

 Syzkaller reported an issue where txBegin may be called
 on a superblock in a read-only mounted filesystem which leads
 to NULL pointer deref. This could be solved by checking if
 the filesystem is read-only before calling txBegin, and returning
 with appropiate error code.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a7225e9e09519deb7e0c42eb6070029cc456e84d`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1b4c144767736221cad92c132f72b3c6ed06a0ea`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a7d17d6bd7cd4f6940b335ea7a6fce5b6d22adc2`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2a3f20efe6c901d4c0871cfd1d8c65e2ade71fc1`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3e94d0d378d2754b26fc54b429582553f7b53e15`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3e5eb6c5ecd8ddb9cfea751cf30f9e23eac97ca3`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fd2db13fb72ff18c633a48229589d42ceb89d1f8`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47cfdc338d674d38f4b2f22b7612cc6a2763ba27`
- `Linux 2.6.12`

## Remediation

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