{"id":"CVE-2026-53221","revision":"4d13a3ac08524979afbf9e9249531074","records":[{"revision":"4d13a3ac08524979afbf9e9249531074","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53221","aliases":[],"title":"ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()\n\nIn vti6_tnl_lookup(), when an exact match for a tunnel fails,\nthe code falls back to searching for wildcard tunnels:\n\n- Tunnels matching the packet's local address, with any remote address\n  wildcard remote).\n\n- Tunnels matching the packet's remote address, with any local address\n  (wildcard local).\n\nHowever, vti6 stores all these different types of tunnels in the same\nhash table (ip6n->tnls_r_l) prone to hash collisions.\n\nThe bug is that the fallback search loops in vti6_tnl_lookup() were\nmissing checks to ensure that the candidate tunnel actually has\na wildcard address.","state":0,"publishedAt":"2026-06-25T08:39:23.177+00:00","modifiedAt":"2026-10-19T19:57:29.527+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_vti.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"c327fa4fca31415431202e063767a7ae342e19c6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"fc657ac0767c49839b3ef0b08dc0953ca30883f8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"47fb3c2b4203556308e64354b3e78f2ce221d646\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"f513f308cc4bdb4530d033431592ffbc29b7fca1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"90fd4513315ca07da99cfd8549d3e553a7160f0d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"2abfb19bbb81958714ad1d43ebeb65b30394184b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7\",\n                            \"lessThan\": \"a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9\",\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/ip6_vti.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.94\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.36\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.13\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6","https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8","https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646","https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1","https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d","https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b","https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53221","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53221","identifiers":["CVE-2026-53221"]},"retained":false,"historicalAffected":[]}],"coverage":[]}