What is CVE-2023-53540?

CVE-2023-53540 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.32 onward and patched in 6.1.55, 6.5.5 and 6.6. CVE-2023-53540 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53540?

CVE-2023-53540 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-2023-53540?

Yes, CVE-2023-53540 has been patched. Fixed versions include 6.1.55, 6.5.5 and 6.6. If you are running Linux kernel 2.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-53540 actively exploited?

CVE-2023-53540 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-53540

Medium

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: reject auth/assoc to AP with our address If the AP uses our own address as its MLD address or BSSID, then clearly something's wrong. Reject such connections so we don't try and fail later.

Package Linux Kernel

Published 2025-10-04

Last modified 2026-04-06

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 2.6.32 and later are affected. Fixed in 6.1.55, 6.5.5, 6.6 and their respective stable series.

Affected from

≥ 2.6.32

Fixed in

✓ 6.1.55 6.1.x ✓ 6.5.5 6.5.x ✓ 6.6

References

The following references provide additional information about CVE-2023-53540 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/07added2c6cd63de047bc786b39436322abb67c0
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5d4e04bf3a0f098bd9033de3a5291810fa14c7a6
Patch
Kernel patch commit
https://git.kernel.org/stable/c/676a423410131d111a264d29aecbe6aadd57fb22
Patch

Details

CVE ID CVE-2023-53540

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-04

Modified 2026-04-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-53540?

CVE-2023-53540 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.32 onward and has been patched in 6.1.55, 6.5.5 and 6.6. CVE-2023-53540 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-53540?

CVE-2023-53540 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-2023-53540?

Yes — CVE-2023-53540 has been patched. Fixed versions include 6.1.55, 6.5.5 and 6.6. If you are running Linux kernel 2.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-53540 actively exploited?

No — CVE-2023-53540 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.