{"id":"CVE-2026-63917","revision":"25131def3f7440c09df7b238ffd9007f","records":[{"revision":"25131def3f7440c09df7b238ffd9007f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63917","aliases":[],"title":"ip6: vti: Use ip6_tnl.net in vti6_changelink().","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6: vti: Use ip6_tnl.net in vti6_changelink().\n\nip netns add ns1\nip netns add ns2\nip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7\nip -n ns1 link set vti6_test netns ns2\nip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9\nip netns del ns2\nip netns del ns1\n[  132.495484] ------------[ cut here ]------------\n[  132.497609] kernel BUG at net/core/dev.c:12376!\n\nCommit 61220ab34948 (\"vti6: Enable namespace changing\") dropped\nNETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then\nmove through IFLA_NET_NS_FD. After the move dev_net(dev) points\nat the new netns while t->net stays at the creation netns.\n\nvti6_changelink() and vti6_update() still use dev_net(dev) and\ndev_net(t->dev). They unlink from one per netns hash and relink\ninto another. The creation netns is left with a stale entry.\ncleanup_net() of that netns later walks freed memory.\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net). Cross tenant scope on container hosts.","state":0,"publishedAt":"2026-07-19T14:55:20.703+00:00","modifiedAt":"2026-10-19T20:17:55.945+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\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"0cdce7618464f7fb06f461e8f4ad575cb1d570f4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"f5c68875e25f331e497ddfbe81e2d8163a87f136\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"d9c5eecdb3c740e65038651db7c686b10d76d1bc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"f1e89a943ee574d0f2f16246eb3f2d7330fdeb03\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"225b467e3b631f38be22e4b38062a1fed02fdd21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"fc32be9ac2788524c6b24efd681cce7a6e731a92\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"ee1778ba0f5cb53be771f97017d01eb356c797bf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"61220ab349485d911083d0b7990ccd3db6c63297\",\n                            \"lessThan\": \"11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe\",\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\": \"3.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.15\",\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\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\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:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4","https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136","https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc","https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03","https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21","https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92","https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf","https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63917","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63917","identifiers":["CVE-2026-63917"]},"retained":false,"historicalAffected":[]}],"coverage":[]}