{"api_version":"1","generated_at":"2026-05-11T11:02:45+00:00","cve":"CVE-2026-43329","urls":{"html":"https://cve.report/CVE-2026-43329","api":"https://cve.report/api/cve/CVE-2026-43329.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43329","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43329"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 14:16:42","updated_at":"2026-05-11 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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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-11T06:33:13.691Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614"},{"url":"https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead"},{"url":"https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc"},{"url":"https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e"},{"url":"https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877"},{"url":"https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e"},{"url":"https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893"}],"title":"netfilter: flowtable: strictly check for maximum number of actions","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43329","datePublished":"2026-05-08T13:31:17.479Z","dateReserved":"2026-05-01T14:12:56.002Z","dateUpdated":"2026-05-11T06:33:13.691Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 14:16:42","lastModifiedDate":"2026-05-11 08:16:09","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43329","Ordinal":"1","Title":"netfilter: flowtable: strictly check for maximum number of actio","CVE":"CVE-2026-43329","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43329","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: flowtable: strictly check for maximum number of actio"}]}}}