What is CVE-2023-52631?

CVE-2023-52631 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 5.15 onward and patched in 5.15.149, 6.1.78, 6.6.17 and others. CVE-2023-52631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-52631?

CVE-2023-52631 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2023-52631?

Yes, CVE-2023-52631 has been patched. Fixed versions include 5.15.149, 6.1.78, 6.6.17 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-52631 actively exploited?

CVE-2023-52631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2023-52631

Medium

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix an NULL dereference bug The issue here is when this is called from ntfs_load_attr_list(). The "size" comes from le32_to_cpu(attr->res.data_size) so it can't overflow on a 64bit systems but on 32bit systems the "+ 1023" can overflow and the result is zero. This means that the kmalloc will succeed by returning the ZERO_SIZE_PTR and then the memcpy() will crash with an Oops on the next line.

Package Linux Kernel

Published 2024-04-02

Last modified 2025-04-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2023-52631 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.15 and later are affected. Fixed in 5.15.149, 6.1.78, 6.6.17, 6.7.5, 6.8 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 5.15.149 5.15.x ✓ 6.1.78 6.1.x ✓ 6.6.17 6.6.x ✓ 6.7.5 6.7.x ✓ 6.8

References

5 total

Kernel Git
https://git.kernel.org/stable/c/686820fe141ea0220fc6fdfc7e5694f915cf64b2

Patch
Kernel Git
https://git.kernel.org/stable/c/ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b

Patch
Kernel Git
https://git.kernel.org/stable/c/b2dd7b953c25ffd5912dda17e980e7168bebcf6c

Patch
Kernel Git
https://git.kernel.org/stable/c/ec1bedd797588fe38fc11cba26d77bb1d9b194c6

Patch
Kernel Git
https://git.kernel.org/stable/c/fb7bcd1722bc9bc55160378f5f99c01198fd14a7

Patch

Details

CVE ID CVE-2023-52631

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-04-02

Modified 2025-04-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-52631?

CVE-2023-52631 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 5.15 onward and has been patched in 5.15.149, 6.1.78, 6.6.17 and others. CVE-2023-52631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-52631?

CVE-2023-52631 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2023-52631?

Yes. CVE-2023-52631 has been patched. Fixed versions include 5.15.149, 6.1.78, 6.6.17 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-52631 actively exploited?

No. CVE-2023-52631 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.