{"id":"CVE-2026-43329","revision":"896e89c072ca4629b59534532797b33a","records":[{"revision":"896e89c072ca4629b59534532797b33a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43329","aliases":[],"title":"netfilter: flowtable: strictly check for maximum number of actions","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.","state":0,"publishedAt":"2026-05-08T13:31:17.479+00:00","modifiedAt":"2026-10-19T19:16:26.468+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_flow_table_offload.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"ead66c77303f760f6c30be96e2e20d5a77cef614\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"fe9018d3e94329f1951b00805a8640bc06f56ead\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"5382bb03e9c33b089d60788478b922a2dca284cc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"57c78bd2e2dd08897acd35b2bf8bcef322e36f5e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"504c9456699dcf4d15195ef34a0fa94a80bfc877\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"879959a7a2be814dd57568655eafa3d8f4d0309e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c29f74e0df7a02b8303bcdce93a7c0132d62577a\",\n                            \"lessThan\": \"76522fcdbc3a02b568f5d957f7e66fc194abb893\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_flow_table_offload.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.203\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.168\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.134\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.81\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.22\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.12\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614","https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead","https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc","https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e","https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877","https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e","https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43329","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43329","identifiers":["CVE-2026-43329"]},"retained":false,"historicalAffected":[]}],"coverage":[]}