What is CVE-2023-53340?

CVE-2023-53340 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 5.18 onward and patched in 6.1.31, 6.3.5 and 6.4. CVE-2023-53340 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53340?

CVE-2023-53340 has a CVSS score of 7.8 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:H/A:H.

Is there a patch available for CVE-2023-53340?

Yes, CVE-2023-53340 has been patched. Fixed versions include 6.1.31, 6.3.5 and 6.4. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-53340 actively exploited?

CVE-2023-53340 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-53340

High

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Collect command failures data only for known commands DEVX can issue a general command, which is not used by mlx5 driver. In case such command is failed, mlx5 is trying to collect the failure data, However, mlx5 doesn't create a storage for this command, since mlx5 doesn't use it. This lead to array-index-out-of-bounds error. Fix it by checking whether the command is known before collecting the failure data.

Package Linux Kernel

Published 2025-09-17

Last modified 2026-01-14

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-129

CVE-2023-53340 is classified as CWE-129

See CWE-129 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 5.18 and later are affected. Fixed in 6.1.31, 6.3.5, 6.4 and their respective stable series.

Affected from

≥ 5.18

Fixed in

✓ 6.1.31 6.1.x ✓ 6.3.5 6.3.x ✓ 6.4

References

The following references provide additional information about CVE-2023-53340 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/2a0a935fb64ee8af253b9c6133bb6702fb152ac2
Patch
Kernel patch commit
https://git.kernel.org/stable/c/411e4d6caa7f7169192b8dacc8421ac4fd64a354
Patch
Kernel patch commit
https://git.kernel.org/stable/c/d8b6f175235d7327b4e1b13216859e89496dfbd5
Patch

Details

CVE ID CVE-2023-53340

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-09-17

Modified 2026-01-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-53340?

CVE-2023-53340 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.31, 6.3.5 and 6.4. CVE-2023-53340 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-53340?

CVE-2023-53340 has a CVSS score of 7.8 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:H/A:H.
Is there a patch available for CVE-2023-53340?

Yes — CVE-2023-53340 has been patched. Fixed versions include 6.1.31, 6.3.5 and 6.4. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-53340 actively exploited?

No — CVE-2023-53340 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.