Is CVE-2024-40921 in the CISA KEV catalog?

No. CVE-2024-40921 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-40921?

CVE-2024-40921 has a CVSS v3 base score of 5.5 (MEDIUM).

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

CVE-2024-40921 has an EPSS score of 0.29% (21th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-40921?

Upgrade linux on debian 12 to 6.1.99-1 or later. Fixes are available for 73 affected products.

CVE & CISA-KEV Catalog

CVE-2024-40921

MEDIUM

5.5

CVSS v3

NVD

Description

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.

How to fix

Remediation Available

linuxDebian

Fixed in:6.1.99-1CVE-2024-40921

Fixed in:6.9.7-1CVE-2024-40921

linuxUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-awsUbuntu

Fixed in:6.8.0-1015.16USN-6999-1

linux-azureUbuntu

Fixed in:6.8.0-1014.16USN-7004-1

linux-gcpUbuntu

Fixed in:6.8.0-1014.16USN-6999-1

linux-gkeUbuntu

Fixed in:6.8.0-1010.13USN-6999-1

linux-hwe-6.8Ubuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-ibmUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-6.8.0-1010-gkeUbuntu

Fixed in:6.8.0-1010.13USN-6999-1

linux-image-6.8.0-1011-raspiUbuntu

Fixed in:6.8.0-1011.12USN-6999-2

linux-image-6.8.0-1012-ibmUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-6.8.0-1012-oemUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-6.8.0-1012-oracleUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-6.8.0-1012-oracle-64kUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-6.8.0-1013-nvidiaUbuntu

Fixed in:6.8.0-1013.14~22.04.1USN-7005-2

Fixed in:6.8.0-1013.14USN-7005-1

linux-image-6.8.0-1013-nvidia-64kUbuntu

Fixed in:6.8.0-1013.14~22.04.1USN-7005-2

Fixed in:6.8.0-1013.14USN-7005-1

linux-image-6.8.0-1013-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1013.14.1USN-7005-1

linux-image-6.8.0-1013-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1013.14.1USN-7005-1

linux-image-6.8.0-1014-azureUbuntu

Fixed in:6.8.0-1014.16USN-7004-1

linux-image-6.8.0-1014-azure-fdeUbuntu

Fixed in:6.8.0-1014.16USN-7004-1

linux-image-6.8.0-1014-gcpUbuntu

Fixed in:6.8.0-1014.16USN-6999-1

linux-image-6.8.0-1015-awsUbuntu

Fixed in:6.8.0-1015.16USN-6999-1

linux-image-6.8.0-44-genericUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-6.8.0-44-generic-64kUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-6.8.0-44-lowlatencyUbuntu

Fixed in:6.8.0-44.44.1~22.04.1USN-7008-1

Fixed in:6.8.0-44.44.1USN-6999-1

linux-image-6.8.0-44-lowlatency-64kUbuntu

Fixed in:6.8.0-44.44.1~22.04.1USN-7008-1

Fixed in:6.8.0-44.44.1USN-6999-1

linux-image-6.8.0-45-genericUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-6.8.0-45-generic-64kUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-awsUbuntu

Fixed in:6.8.0-1015.16USN-6999-1

linux-image-azureUbuntu

Fixed in:6.8.0-1014.16USN-7004-1

linux-image-azure-fdeUbuntu

Fixed in:6.8.0-1014.16USN-7004-1

linux-image-gcpUbuntu

Fixed in:6.8.0-1014.16USN-6999-1

linux-image-genericUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-generic-64kUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-generic-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-generic-64k-hwe-24.04Ubuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-generic-hwe-22.04Ubuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-generic-hwe-24.04Ubuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-generic-lpaeUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-gkeUbuntu

Fixed in:6.8.0-1010.13USN-6999-1

linux-image-ibmUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-ibm-classicUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-ibm-lts-24.04Ubuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-kvmUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-lowlatencyUbuntu

Fixed in:6.8.0-44.44.1USN-6999-1

linux-image-lowlatency-64kUbuntu

Fixed in:6.8.0-44.44.1USN-6999-1

linux-image-lowlatency-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-44.44.1~22.04.1USN-7008-1

linux-image-lowlatency-hwe-22.04Ubuntu

Fixed in:6.8.0-44.44.1~22.04.1USN-7008-1

linux-image-nvidiaUbuntu

Fixed in:6.8.0-1013.13USN-7005-1

linux-image-nvidia-6.8Ubuntu

Fixed in:6.8.0-1013.14~22.04.1USN-7005-2

linux-image-nvidia-64kUbuntu

Fixed in:6.8.0-1013.13USN-7005-1

linux-image-nvidia-64k-6.8Ubuntu

Fixed in:6.8.0-1013.14~22.04.1USN-7005-2

linux-image-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1013.14.1USN-7005-1

linux-image-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1013.14.1USN-7005-1

linux-image-oem-22.04Ubuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-oem-22.04aUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-oem-22.04bUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-oem-22.04cUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-oem-22.04dUbuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-oracleUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-oracle-64kUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-image-raspiUbuntu

Fixed in:6.8.0-1011.12USN-6999-2

linux-image-virtualUbuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-image-virtual-hwe-22.04Ubuntu

Fixed in:6.8.0-45.45~22.04.1USN-7029-1

linux-image-virtual-hwe-24.04Ubuntu

Fixed in:6.8.0-44.44USN-6999-1

linux-lowlatencyUbuntu

Fixed in:6.8.0-44.44.1USN-6999-1

linux-lowlatency-hwe-6.8Ubuntu

Fixed in:6.8.0-44.44.1~22.04.1USN-7008-1

linux-nvidiaUbuntu

Fixed in:6.8.0-1013.14USN-7005-1

linux-nvidia-6.8Ubuntu

Fixed in:6.8.0-1013.14~22.04.1USN-7005-2

linux-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1013.14.1USN-7005-1

linux-oem-6.8Ubuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-oracleUbuntu

Fixed in:6.8.0-1012.12USN-6999-1

linux-raspiUbuntu

Fixed in:6.8.0-1011.12USN-6999-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.29%probability of exploitation in 30 days

21stpercentile

Low risk: more likely to be exploited than 21% of all known CVEs.

References

Patch4

Other references1

lists.debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.