What is CVE-2024-40920?

CVE-2024-40920 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 6.8.12 onward and patched in 6.9, 6.1.95, 6.6.35 and others. CVE-2024-40920 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2024-40920?

CVE-2024-40920 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-2024-40920?

Yes, CVE-2024-40920 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-2024-40920 actively exploited?

CVE-2024-40920 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2024-40920

High

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: fix suspicious rcu usage in br_mst_set_state I converted br_mst_set_state to RCU to avoid a vlan use-after-free but forgot to change the vlan group dereference helper. Switch to vlan group RCU deref helper to fix the suspicious rcu usage warning.

Package Linux Kernel

Published 2024-07-12

Last modified 2025-11-03

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-416

CVE-2024-40920 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

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/406bfc04b01ee47e4c626f77ecc7d9f85135b166

Patch
Kernel Git
https://git.kernel.org/stable/c/546ceb1dfdac866648ec959cbc71d9525bd73462

Patch
Kernel Git
https://git.kernel.org/stable/c/7caefa2771722e65496d85b62e1dc4442b7d1345

Patch
Kernel Git
https://git.kernel.org/stable/c/caaa2129784a04dcade0ea92c12e6ff90bbd23d8

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

Details

CVE ID CVE-2024-40920

Severity High

CVSS score 7.8 / 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-2024-40920?

CVE-2024-40920 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . 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-2024-40920 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2024-40920?

CVE-2024-40920 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-2024-40920?

Yes. CVE-2024-40920 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-2024-40920 actively exploited?

No. CVE-2024-40920 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.