netfilter: flowtable: strictly check for maximum number of actions_CVE-2026-43329

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: strictly check for maximum number of actions\n\nThe maximum number of flowtable hardware offload actions in IPv6 is:\n\n* ethernet mangling (4 payload actions, 2 for each ethernet address)\n* SNAT (4 payload actions)\n* DNAT (4 payload actions)\n* Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing)\n  for QinQ.\n* Redirect (1 action)\n\nWhich makes 17, while the maximum is 16. But act_ct supports for tunnels\nactions too. Note that payload action operates at 32-bit word level, so\nmangling an IPv6 address takes 4 payload actions.\n\nUpdate flow_action_entry_next() calls to check for the maximum number of\nsupported actions.\n\nWhile at it, rise the maximum number of actions per flow from 16 to 24\nso this works fine with IPv6 setups.",
    "published": "2026-05-08T13:31:17.479Z",
    "modified": "2026-05-11T06:33:13.691Z",
    "type": "cve",
    "title": "netfilter: flowtable: strictly check for maximum number of actions",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614\nhttps://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead\nhttps://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc\nhttps://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e\nhttps://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877\nhttps://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e\nhttps://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893",
    "id": "CVE-2026-43329",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux c29f74e0df7a02b8303bcdce93a7c0132d62577a\nLinux Linux 5.5",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_score": 0
}