{"id":"CVE-2026-72348","revision":"596436735b394cbca88f4d77d0f0d402","records":[{"revision":"596436735b394cbca88f4d77d0f0d402","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72348","aliases":[],"title":"netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop\n\nThe ah, hbh and rt matches check that the fixed extension header is\npresent, then use the header length field to derive the advertised\nextension header length for matching.\n\nFor the ah match, add the missing advertised-length check. For hbh\nand rt, update the existing advertised-length checks. In all three\ncases, set hotdrop to true before returning false when the advertised\nextension header length exceeds the available skb data.\n\nReturning false treats the packet as a rule mismatch. Set hotdrop to\ntrue and drop malformed packets so they cannot bypass rules intended\nto drop packets with these IPv6 extension headers.","state":0,"publishedAt":"2026-08-15T05:55:52.295+00:00","modifiedAt":"2026-10-16T18:55:19.696+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/ipv6/netfilter/ip6t_ah.c\",\n                        \"net/ipv6/netfilter/ip6t_hbh.c\",\n                        \"net/ipv6/netfilter/ip6t_rt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"f16d856b6af5fd0e7cb0b0212f70825b599ef72e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"fc416870100cf16d5b9495199355a679c3a02d48\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"f775fcf384b06f35b612f78fa5601fee99eb6513\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"2fd89a50a9783eed8ed23866b11c8b3d8779a7a8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"3578b6d92a5b1e603ae6e8c8f5538a709f03aba4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"3d441be2b1c5e98167302fa1c7b61960a067b112\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\n                            \"lessThan\": \"43ccc20b5a733226417832cf16ef45322e594990\",\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/ipv6/netfilter/ip6t_ah.c\",\n                        \"net/ipv6/netfilter/ip6t_hbh.c\",\n                        \"net/ipv6/netfilter/ip6t_rt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/f16d856b6af5fd0e7cb0b0212f70825b599ef72e","https://git.kernel.org/stable/c/fc416870100cf16d5b9495199355a679c3a02d48","https://git.kernel.org/stable/c/f775fcf384b06f35b612f78fa5601fee99eb6513","https://git.kernel.org/stable/c/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8","https://git.kernel.org/stable/c/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4","https://git.kernel.org/stable/c/3d441be2b1c5e98167302fa1c7b61960a067b112","https://git.kernel.org/stable/c/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7","https://git.kernel.org/stable/c/43ccc20b5a733226417832cf16ef45322e594990"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72348","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72348","identifiers":["CVE-2026-72348"]},"retained":false,"historicalAffected":[]}],"coverage":[]}