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CVE-2026-43451

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path nfqnl_recv_verdict() calls find_dequeue_entry() to remo…

Published May 8, 2026CWE-401EPSS 0.16%

Overview

CVE-2026-43451 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue

entry from the queue data structures, taking ownership of the entry.

For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN

attributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN

present but NFQA_VLAN_TCI missing), the function returns immediately

without freeing the dequeued entry or its sk_buff.

This leaks the nf_queue_entry, its associated sk_buff, and all held

references (net_device refcounts, struct net refcount). Repeated

triggering exhausts kernel memory.

Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict

on the error path, consistent with other error handling in this file.

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/0b18d1b834ab5a5009be70b530f978d7989e445bRefgit.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275Refgit.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982Refgit.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41Refgit.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794Refgit.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97bRefgit.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032fRefgit.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43451?

CVE-2026-43451 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43451?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43451?

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-2026-43451?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43451 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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