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CVE-2026-43084

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: make hash table per queue Sharing a global hash table among all queues is tempting, but it can caus…

Published May 6, 2026CWE-416EPSS 0.17%

Overview

CVE-2026-43084 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: make hash table per queue

Sharing a global hash table among all queues is tempting, but

it can cause crash:

BUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]

[..]

nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]

nfnetlink_rcv_msg+0x46a/0x930

kmem_cache_alloc_node_noprof+0x11e/0x450

struct nf_queue_entry is freed via kfree, but parallel cpu can still

encounter such an nf_queue_entry when walking the list.

Alternative fix is to free the nf_queue_entry via kfree_rcu() instead,

but as we have to alloc/free for each skb this will cause more mem

pressure.

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/22730cb96093b5be0609063bbb1923dbecd61252Refgit.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046aRefgit.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9dRefgit.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43084?

CVE-2026-43084 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43084?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43084?

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-2026-43084?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43084 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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