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CVE-2026-72416: netfilter: nft_compat: ebtables emulation must reject non-bridge targets

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_compat: ebtables emulation must reject non-bridge targets xtables targets return netfilter verdicts: NF_ACCEPT, NF_DROP, and so on. ebtables targets return incompatible verdicts: EBT_ACCEPT, EBT_DROP, ... We cannot allow fallback to NFPROTO_UNSPEC. ebtables doesn't permit this since 11ff7288beb2 ("netfilter: ebtables: reject non-bridge targets") but that commit missed the nft_compat layer.

Affected products

• Linux: 3.13 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/33e1875d6b5b552a2e5652b40074c604199354ee
• https://git.kernel.org/stable/c/7c4f6a55a0fa8efbbe06dfed3fd440bca121f41a
• https://git.kernel.org/stable/c/9dbba7e694ec045f21ede2f892fb42b81b4e1692
• https://git.kernel.org/stable/c/b3f7a84540a0d014ec42343ff5909657c1bd1994
• https://git.kernel.org/stable/c/c129b0185e707dce405968e21afccd5728b2ce63
• https://git.kernel.org/stable/c/efc17b9240d821c424bc5191a5c6e9384a06293e

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