CVE-2026-43024 netfilter: nf_tables: reject immediate NF_QUEUE verdict

What is CVE-2026-43024?

CVE-2026-43024 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

netfilter: nf_tables: reject immediate NF_QUEUE verdict

nft_queue is always used from userspace nftables to deliver the NF_QUEUE verdict. Immediately emitting an NF_QUEUE verdict is never used by the userspace nft tools, so reject immediate NF_QUEUE verdicts.

The arp family does not provide queue support, but such an immediate verdict is still reachable. Globally reject NF_QUEUE immediate verdicts to address this issue.

Which versions are affected by CVE-2026-43024?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43024?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-43024 being exploited?

There is no known exploitation of CVE-2026-43024 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43024, DEBIAN-CVE-2026-43024, GHSA-g9qr-gmhx-8q7c, ROOT-OS-DEBIAN-11-CVE-2026-43024, ROOT-OS-UBUNTU-2204-CVE-2026-43024, ROOT-OS-UBUNTU-2404-CVE-2026-43024 and 1 more.