{"api_version":"1","generated_at":"2026-07-22T04:36:25+00:00","cve":"CVE-2026-63917","urls":{"html":"https://cve.report/CVE-2026-63917","api":"https://cve.report/api/cve/CVE-2026-63917.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63917","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63917"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:09","updated_at":"2026-07-20 15:16:55"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92","name":"https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21","name":"https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc","name":"https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf","name":"https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136","name":"https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4","name":"https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03","name":"https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe","name":"https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63917","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63917","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 0cdce7618464f7fb06f461e8f4ad575cb1d570f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 f5c68875e25f331e497ddfbe81e2d8163a87f136 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 d9c5eecdb3c740e65038651db7c686b10d76d1bc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 f1e89a943ee574d0f2f16246eb3f2d7330fdeb03 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 225b467e3b631f38be22e4b38062a1fed02fdd21 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 fc32be9ac2788524c6b24efd681cce7a6e731a92 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 ee1778ba0f5cb53be771f97017d01eb356c797bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61220ab349485d911083d0b7990ccd3db6c63297 11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63917","cve":"CVE-2026-63917","epss":"0.002100000","percentile":"0.113610000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/ip6_vti.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0cdce7618464f7fb06f461e8f4ad575cb1d570f4","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"f5c68875e25f331e497ddfbe81e2d8163a87f136","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"d9c5eecdb3c740e65038651db7c686b10d76d1bc","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"f1e89a943ee574d0f2f16246eb3f2d7330fdeb03","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"225b467e3b631f38be22e4b38062a1fed02fdd21","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"fc32be9ac2788524c6b24efd681cce7a6e731a92","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"ee1778ba0f5cb53be771f97017d01eb356c797bf","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"},{"lessThan":"11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe","status":"affected","version":"61220ab349485d911083d0b7990ccd3db6c63297","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/ip6_vti.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.15"},{"lessThan":"3.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:27.007Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4"},{"url":"https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136"},{"url":"https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc"},{"url":"https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03"},{"url":"https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21"},{"url":"https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92"},{"url":"https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf"},{"url":"https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"}],"title":"ip6: vti: Use ip6_tnl.net in vti6_changelink().","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63917","datePublished":"2026-07-19T14:55:20.703Z","dateReserved":"2026-07-19T07:54:57.020Z","dateUpdated":"2026-07-20T13:41:27.007Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:09","lastModifiedDate":"2026-07-20 15:16:55","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2,"impactScore":6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63917","Ordinal":"1","Title":"ip6: vti: Use ip6_tnl.net in vti6_changelink().","CVE":"CVE-2026-63917","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63917","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ip6: vti: Use ip6_tnl.net in vti6_changelink()."}]}}}