CVE-2024-49957

Severity CVSS v4.0:

Pending analysis

Type:

CWE-476 NULL Pointer Dereference

Publication date:

21/10/2024

Last modified:

03/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix null-ptr-deref when journal load failed. During the mounting process, if journal_reset() fails because of too short journal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. Subsequently, ocfs2_journal_shutdown() calls jbd2_journal_flush()->jbd2_cleanup_journal_tail()-> __jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail() ->lock_buffer(journal->j_sb_buffer), resulting in a null-pointer dereference error. To resolve this issue, we should check the JBD2_LOADED flag to ensure the journal was properly loaded. Additionally, use journal instead of osb->journal directly to simplify the code.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	2.6.32 (including)	5.10.227 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.168 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.113 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.55 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.10.14 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.11 (including)	6.11.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2024-49957

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools