{"id":"CVE-2026-89562","revision":"bbf5a31a1e7d41f8a75b6ec4c61a6a0b","records":[{"revision":"bbf5a31a1e7d41f8a75b6ec4c61a6a0b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89562","aliases":[],"title":"ip6_gre: fix hardware header length for NBMA tunnels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: fix hardware header length for NBMA tunnels\n\nip6gre_tnl_link_config_route() accumulates the lower device's hardware\nheader length into dev->hard_header_len whenever header_ops is set. This\nis incorrect for both users of header_ops.\n\nip6gretap and ip6erspan have a fixed Ethernet hardware header length.\nFor an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header,\nthe optional FOU or GUE header, and the outer IPv6 header. The lower\ndevice header is headroom needed later, not part of the tunnel device's\nhardware header.\n\nKeep the lower device header in needed_headroom. Set hard_header_len to\nthe tunnel header length only for ARPHRD_IP6GRE devices with header_ops,\nand leave the fixed Ethernet header length unchanged for tap and erspan\ndevices.","state":0,"publishedAt":"2026-09-11T19:44:33.576+00:00","modifiedAt":"2026-10-19T08:48:55.787+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/ip6_gre.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"cb1afd087aedc90e5274537e4fb9bf3f98e5afdb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"b1e95e3602d8e112458627f14c6c31c21f2188cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"c3457a5aae5fb43f7023d3f3dc472c2afa22acf0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"8bfe746afee38dd6e4348ddcd22d554789dbb9ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"b8282668d8fa7c61b80e8e4890729031c291a16c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"565038b0092f65afe384961c0f548d605bf438b9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"832ba596494b2c9eac7760259eff2d8b7dcad0ee\",\n                            \"lessThan\": \"505b6d296c486ef7d1274f279d4c43a172f63224\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf3d9717a5271573fa193c4dfa0df856295d5b15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"187a6daf5db45adc807c85bbe285319107bed198\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d9897bb66ce989325b4bf4cdbb6a799e4ac878b6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.19.162\",\n                            \"lessThan\": \"4.20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.82\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.9.13\",\n                            \"lessThan\": \"5.10\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/ip6_gre.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\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/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb","https://git.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a","https://git.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cb","https://git.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0","https://git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff","https://git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c","https://git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9","https://git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89562","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89562","identifiers":["CVE-2026-89562"]},"retained":false,"historicalAffected":[]}],"coverage":[]}