CVE-2026-43024

netfilter: nf_tables: reject immediate NF_QUEUE verdict

MEDIUM

5.5

CVSS Score

Published: May 1, 2026 at 02:15 PM UTC

Updated: October 15, 2026 at 02:19 AM UTC

4 products affected across 2 vendorsLinux KernelSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSiplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.19.307 ≤ v < 4.205.10.210 ≤ v < 5.10.2535.15.149 ≤ v < 5.15.2035.4.269 ≤ v < 5.56.1.76 ≤ v < 6.1.1686.13 ≤ v < 6.18.226.19 ≤ v < 6.19.126.6.15 ≤ v < 6.6.1346.7.3 ≤ v < 6.86.8.1 ≤ v < 6.12.814.19.3074e66422f1b56149761dc76030e6345d1cca6f8695.10.210 5.15.149 5.4.26955a60251fa50d4e68175e36666b536a602ce4f6c6.1.76 6.6.15 6.7.3 6.8 6.8 rc2 6.8 rc3 6.8 rc4 6.8 rc5 6.8 rc6 6.8 rc76653118b176a00915125521c6572ae8e507621db7.0 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc68365e9d92b85fda975a5ece7a3a139cb964018c88e34430e33b8a80bc014f3efe29cac76bc30a4b4960cf4f812530f01f6acc6878ceaa5404c06af7bf05a497e7bc8851eeeb3a58da180ba469efebb05f342de4e2f33e0e39165d8639387aa6c19dff660

Vendor states this is fixed in 17dc5d5a935c771338430cbc156a16a51cfd31e8 (fixed)

Vendor states this is fixed in 2f7f825a548be55420f0f5f716f6c27b9d312d3f (fixed)

Vendor states this is fixed in 42a47f4b1b7695026ab9bc1bb35d4622b0835c95 (fixed)

Vendor states this is fixed in 4b12a3cc3f075e750cc3c5e693fd25fb400af4a2 (fixed)

Vendor states this is fixed in 68390437a998c3f2c57212b413abef5e6d657d88 (fixed)

Vendor states this is fixed in da107398cbd4bbdb6bffecb2ce86d5c9384f4cec (fixed)

Vendor states this is fixed in f140593901724cfbd16597c3a4fcb24a58ae44b0 (fixed)

Vendor states this is fixed in f710691be163ae6b39e4bcab9e5be32d329f035b (fixed)

Affected range stops below 4.20, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.253 (unaffected)

Vendor states this is fixed in 5.15.203 (unaffected)

Affected range stops below 5.5, so it looks safe — our inference, not a vendor statement