What is CVE-2023-3865?

CVE-2023-3865 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 5.15 onward and patched in 5.15.121, 6.1.36, 6.3.10 and others. CVE-2023-3865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-3865?

CVE-2023-3865 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2023-3865?

Yes, CVE-2023-3865 has been patched. Fixed versions include 5.15.121, 6.1.36, 6.3.10 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-2023-3865 actively exploited?

CVE-2023-3865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2023-3865

High

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bound read in smb2_write ksmbd_smb2_check_message doesn't validate hdr->NextCommand. If ->NextCommand is bigger than Offset + Length of smb2 write, It will allow oversized smb2 write length. It will cause OOB read in smb2_write.

Package Linux Kernel

Published 2025-08-16

Last modified 2025-11-18

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2023-3865 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.15 and later are affected. Fixed in 5.15.121, 6.1.36, 6.3.10, 6.4 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 5.15.121 5.15.x ✓ 6.1.36 6.1.x ✓ 6.3.10 6.3.x ✓ 6.4

References

4 total

Kernel Git
https://git.kernel.org/stable/c/3813eee5154d6a4c5875cb4444cb2b63bac8947f

Patch
Kernel Git
https://git.kernel.org/stable/c/58a9c41064df27632e780c5a3ae3e0e4284957d1

Patch
Kernel Git
https://git.kernel.org/stable/c/5fe7f7b78290638806211046a99f031ff26164e1

Patch
Kernel Git
https://git.kernel.org/stable/c/c86211159bc3178b891e0d60e586a32c7b6a231b

Patch

Details

CVE ID CVE-2023-3865

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2025-08-16

Modified 2025-11-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-3865?

CVE-2023-3865 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 5.15 onward and has been patched in 5.15.121, 6.1.36, 6.3.10 and others. CVE-2023-3865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-3865?

CVE-2023-3865 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2023-3865?

Yes. CVE-2023-3865 has been patched. Fixed versions include 5.15.121, 6.1.36, 6.3.10 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-2023-3865 actively exploited?

No. CVE-2023-3865 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.