Linux Kernel up to 5.18 Journaling File System fs/jfs/jfs_dmap.c dbFree null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 5.18. Impacted is the function dbFree of the file fs/jfs/jfs_dmap.c of the component Journaling File System Handler. Executing a manipulation can lead to null pointer dereference. This vulnerability is tracked as CVE-2023-4385. The attack is restricted to local execution. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.18 (Operating System) and classified as critical. This vulnerability affects the function dbFree of the file fs/jfs/jfs_dmap.c of the component Journaling File System Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

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.

The weakness was disclosed 08/16/2023 as 0d4837fdb796f99369cf7691d33de1b856bcaf1f. The advisory is shared for download at github.com. This vulnerability was named CVE-2023-4385. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 250173 (Linux Distros Unpatched Vulnerability : CVE-2023-4385), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.19-rc1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 0d4837fdb796f99369cf7691d33de1b856bcaf1f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (250173). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 250173
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-4385

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.19-rc1
Patch: 0d4837fdb796f99369cf7691d33de1b856bcaf1f

Timelineinfo

08/16/2023 🔍
08/16/2023 +0 days 🔍
08/16/2023 +0 days 🔍
08/17/2025 +732 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 0d4837fdb796f99369cf7691d33de1b856bcaf1f
Status: Confirmed

CVE: CVE-2023-4385 (🔍)
GCVE (CVE): GCVE-0-2023-4385
GCVE (VulDB): GCVE-100-237352

Entryinfo

Created: 08/16/2023 22:44
Updated: 08/17/2025 09:02
Changes: 08/16/2023 22:44 (56), 09/10/2023 14:56 (1), 08/17/2025 09:02 (17)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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