{"schema_version":"1.9.0","id":"CVE-2026-63917","published":"2026-07-19T14:55:20.703Z","modified":"2026-08-31T18:26:07.577771860Z","related":["SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3593-1","SUSE-SU-2026:3595-1","SUSE-SU-2026:3602-1","SUSE-SU-2026:3616-1","SUSE-SU-2026:3617-1","SUSE-SU-2026:3790-1","SUSE-SU-2026:3810-1"],"summary":"ip6: vti: Use ip6_tnl.net in vti6_changelink().","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"61220ab349485d911083d0b7990ccd3db6c63297"},{"fixed":"0cdce7618464f7fb06f461e8f4ad575cb1d570f4"},{"fixed":"f5c68875e25f331e497ddfbe81e2d8163a87f136"},{"fixed":"d9c5eecdb3c740e65038651db7c686b10d76d1bc"},{"fixed":"f1e89a943ee574d0f2f16246eb3f2d7330fdeb03"},{"fixed":"225b467e3b631f38be22e4b38062a1fed02fdd21"},{"fixed":"fc32be9ac2788524c6b24efd681cce7a6e731a92"},{"fixed":"ee1778ba0f5cb53be771f97017d01eb356c797bf"},{"fixed":"11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63917.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.15.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63917.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63917.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63917"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63917.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}