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CVE-2021-47340

kernel: jfs: fix GPF in diFree

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 21, 2024

Updated · November 21, 2025

Description

A vulnerability was found in the Linux kernel's JFS, where the diFree function could access an invalid pointer. This occurs if a certain inode structure has a null pointer, potentially leading to system crashes or unexpected behavior when the kernel tries to manage file system metadata.

Statement

This vulnerability is rated as a moderate severity because it can cause system crashes or instability due to invalid memory access but does not directly lead to data corruption or unauthorized access.

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

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference