What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-01 · updated 2026-10-15

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.

Affected products

• Linux kernel: from 4.19.307 before 4.20; from 5.4.269 before 5.5; from 5.10.210 before 5.10.253; from 5.15.149 before 5.15.203; from 6.1.76 before 6.1.168; from 6.6.15 before 6.6.134 — fixed in 4.20, 5.10.253, 5.15.203, 5.5, 6.1.168, 6.12.81

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.253, 5.15.203, 5.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/17dc5d5a935c771338430cbc156a16a51cfd31e8
• https://git.kernel.org/stable/c/2f7f825a548be55420f0f5f716f6c27b9d312d3f
• https://git.kernel.org/stable/c/42a47f4b1b7695026ab9bc1bb35d4622b0835c95
• https://git.kernel.org/stable/c/4b12a3cc3f075e750cc3c5e693fd25fb400af4a2
• https://git.kernel.org/stable/c/68390437a998c3f2c57212b413abef5e6d657d88
• https://git.kernel.org/stable/c/da107398cbd4bbdb6bffecb2ce86d5c9384f4cec
• https://git.kernel.org/stable/c/f140593901724cfbd16597c3a4fcb24a58ae44b0
• https://git.kernel.org/stable/c/f710691be163ae6b39e4bcab9e5be32d329f035b
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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