What is CVE-2024-40921?

CVE-2024-40921 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.8.12 onward and patched in 6.9, 6.1.95, 6.6.35 and others. CVE-2024-40921 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2024-40921?

CVE-2024-40921 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-2024-40921?

Yes, CVE-2024-40921 has been patched. Fixed versions include 6.9, 6.1.95, 6.6.35 and others. If you are running Linux kernel 6.8.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2024-40921 actively exploited?

CVE-2024-40921 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2024-40921

Medium

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state Pass the already obtained vlan group pointer to br_mst_vlan_set_state() instead of dereferencing it again. Each caller has already correctly dereferenced it for their context. This change is required for the following suspicious RCU dereference fix. No functional changes intended.

Package Linux Kernel

Published 2024-07-12

Last modified 2025-11-03

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 6.8.12, 6.1.93, 6.6.33, 6.9.3 and later are affected. Fixed in 6.9, 6.1.95, 6.6.35, 6.9.6 and their respective stable series.

Affected from

≥ 6.8.12 ≥ 6.1.93 ≥ 6.6.33 ≥ 6.9.3

Fixed in

✓ 6.9 6.9.x ✓ 6.1.95 6.1.x ✓ 6.6.35 6.6.x ✓ 6.9.6 6.9.x

References

5 total

Kernel Git
https://git.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ff

Patch
Kernel Git
https://git.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509

Patch
Kernel Git
https://git.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6ca

Patch
Kernel Git
https://git.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5

Patch
Debian Security
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Details

CVE ID CVE-2024-40921

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-07-12

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2024-40921?

CVE-2024-40921 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.8.12 onward and has been patched in 6.9, 6.1.95, 6.6.35 and others. CVE-2024-40921 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2024-40921?

CVE-2024-40921 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-2024-40921?

Yes. CVE-2024-40921 has been patched. Fixed versions include 6.9, 6.1.95, 6.6.35 and others. If you are running Linux kernel 6.8.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2024-40921 actively exploited?

No. CVE-2024-40921 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.