---
id: CVE-2023-4385
title: 'Kernel: jfs: null pointer dereference in dbfree()'
summary: >-
  A NULL pointer dereference flaw was found in dbFree in fs/jfs/jfs_dmap.c in
  the journaling file system (JFS) in the Linux Kernel. This issue may allow a
  local attacker to crash the system due to a missing sanity check.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Red Hat
product: kernel
affected:
  - kernel
  - kernel
  - kernel-rt
  - kernel
  - kernel-rt
  - kernel
  - kernel-rt
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-02-26T21:50:19.074150Z'
published: '2023-08-16'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T13:41:48.853Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-4385'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4385'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2219272'
    label: RHBZ#2219272
  - url: >-
      https://github.com/torvalds/linux/commit/0d4837fdb796f99369cf7691d33de1b856bcaf1f
tags:
  - cve.org
epss: 0.00233
epssPercentile: 0.14315
ingestedAt: '2026-11-07T14:18:21.468Z'
---

## Overview

A NULL pointer dereference flaw was found in dbFree in fs/jfs/jfs_dmap.c in the journaling file system (JFS) in the Linux Kernel. This issue may allow a local attacker to crash the system due to a missing sanity check.

## Affected

- `kernel`
- `kernel`
- `kernel-rt`
- `kernel`
- `kernel-rt`
- `kernel`
- `kernel-rt`

## Remediation

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