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CVE-2026-74480

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in it…

Published Aug 15, 2026EPSS 0.58%

Overview

CVE-2026-74480 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: bridge: stop fast-leave after deleting a port group

br_multicast_leave_group() iterates mp->ports with pp = &p->next in

its fast-leave path. After br_multicast_del_pg() removes p,

continuing the loop advances pp through the deleted entry.

If multicast-to-unicast was enabled, the bridge can hold multiple port

groups for the same port and group with different source MAC

addresses. Once multicast-to-unicast is disabled,

br_port_group_equal() matches those entries by port only. A fast leave

can then delete one entry and continue from its stale next pointer,

leaving mp->ports pointing at a deleted port group.

Fast leave only needs to remove one matching port group. Break after

br_multicast_del_pg() so the loop stops before dereferencing the

removed entry.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0309ebbc570000ea0df11c06b69798e5860c5f6fRefgit.kernel.org/stable/c/159ad90cb929c033308bb39a2c5f8fbf393b77aaRefgit.kernel.org/stable/c/1a109cc9890d017c41d77e6c82da739579c49f0bRefgit.kernel.org/stable/c/4695430e8132420bf8de94da3eb36a6cf35fde6bRefgit.kernel.org/stable/c/482bcb85139addb4e8ac8ed10baeda3e0aad4031Refgit.kernel.org/stable/c/4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4Refgit.kernel.org/stable/c/a39789f211b8a4125f0c70e05b30cf715f4f187dRefgit.kernel.org/stable/c/d6c32e2e25a9a06ba021030e26b6d602a277eb72

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74480?

CVE-2026-74480 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-74480?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-74480?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74480?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74480 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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