CVE-2023-53766

kernel: FS: JFS: Check for read-only mounted filesystem in txBegin

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · December 8, 2025

Updated · June 30, 2026

Description

JFS filesystem code neglects to verify whether the filesystem is mounted read-only before initiating transactions in txBegin(). When write operations are attempted on a read-only mount, the missing check allows execution to proceed with uninitialized transaction structures, culminating in a NULL pointer dereference and kernel crash.

Statement

JFS usage has declined significantly in modern deployments. Exploitation requires local filesystem access and specific mount configurations. ext4 or XFS are recommended as alternatives where possible.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference