netfilter: nf_tables: reject immediate NF_QUEUE verdict
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.
02 / AFFECTED SOFTWARE
Affected packages
1687 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- 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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43024.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-43024