CVE-2021-47179

Severity CVSS v4.0:

Pending analysis

Type:

CWE-476 NULL Pointer Dereference

Publication date:

25/03/2024

Last modified:

16/05/2024

Description

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() Commit de144ff4234f changes _pnfs_return_layout() to call pnfs_mark_matching_lsegs_return() passing NULL as the struct pnfs_layout_range argument. Unfortunately, pnfs_mark_matching_lsegs_return() doesn&#39;t check if we have a value here before dereferencing it, causing an oops. I&#39;m able to hit this crash consistently when running connectathon basic tests on NFS v4.1/v4.2 against Ontap.

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::::::::	4.9.269 (including)	4.9.271 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.14.233 (including)	4.14.235 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.19.191 (including)	4.19.193 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.4.118 (including)	5.4.124 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.10.36 (including)	5.10.42 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.12.3 (including)	5.12.9 (excluding)

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

CVE-2021-47179

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools