What is CVE-2023-4515?

CVE-2023-4515 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.15.121 onward and patched in 5.15.127, 6.1.46, 6.4.11 and others. CVE-2023-4515 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-4515?

CVE-2023-4515 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-2023-4515?

Yes, CVE-2023-4515 has been patched. Fixed versions include 5.15.127, 6.1.46, 6.4.11 and others. If you are running Linux kernel 5.15.121 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-4515 actively exploited?

CVE-2023-4515 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-4515

Medium

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate command request size In commit 2b9b8f3b68ed ("ksmbd: validate command payload size"), except for SMB2_OPLOCK_BREAK_HE command, the request size of other commands is not checked, it's not expected. Fix it by add check for request size of other commands.

Package Linux Kernel

Published 2025-08-16

Last modified 2025-11-18

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

Affected versions

Linux kernel versions 5.15.121, 6.1.36, 6.3.10, 6.4 and later are affected. Fixed in 5.15.127, 6.1.46, 6.4.11, 6.5 and their respective stable series.

Affected from

≥ 5.15.121 ≥ 6.1.36 ≥ 6.3.10 ≥ 6.4

Fixed in

✓ 5.15.127 5.15.x ✓ 6.1.46 6.1.x ✓ 6.4.11 6.4.x ✓ 6.5

References

The following references provide additional information about CVE-2023-4515 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/595679098bdcdbfbba91ebe07a2f7f208df93870
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3c
Patch
Kernel patch commit
https://git.kernel.org/stable/c/c6bef3bc30fd4a175aef846b7d928a6c40d091cd
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2023-4515

Severity Medium

CVSS score 5.5 / 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-2023-4515?

CVE-2023-4515 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.15.121 onward and has been patched in 5.15.127, 6.1.46, 6.4.11 and others. CVE-2023-4515 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-4515?

CVE-2023-4515 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-2023-4515?

Yes — CVE-2023-4515 has been patched. Fixed versions include 5.15.127, 6.1.46, 6.4.11 and others. If you are running Linux kernel 5.15.121 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-4515 actively exploited?

No — CVE-2023-4515 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.