{"api_version":"1","generated_at":"2026-05-28T15:54:16+00:00","cve":"CVE-2026-46120","urls":{"html":"https://cve.report/CVE-2026-46120","api":"https://cve.report/api/cve/CVE-2026-46120.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46120","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46120"},"summary":{"title":"ip6_gre: Use cached t->net in ip6erspan_changelink().","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: Use cached t->net in ip6erspan_changelink().\n\nAfter commit 5e72ce3e3980 (\"net: ipv6: Use link netns in newlink() of\nrtnl_link_ops\"), ip6erspan_newlink() correctly resolves the per-netns\nip6gre hash via link_net. ip6erspan_changelink() was not converted in\nthat series and still uses dev_net(dev), which diverges from the\ndevice's creation netns after IFLA_NET_NS_FD migration.\n\nThis re-inserts the tunnel into the wrong per-netns hash. The\noriginal netns keeps a stale entry. When that netns is later\ndestroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a\nslab-use-after-free reported by KASAN, followed by a kernel BUG at\nnet/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net).\n\nip6gre_changelink() earlier in the same file already uses the cached\nt->net; only ip6erspan_changelink() has the wrong shape.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:27","updated_at":"2026-05-28 13:44:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2","name":"https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702","name":"https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82","name":"https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91","name":"https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e","name":"https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46120","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46120","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d665034f239412927b1e71329f20f001c92da09 eca62bb0569de4d43a4dac06a2092a9d4ca1d702 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d665034f239412927b1e71329f20f001c92da09 311fdd26eb4443d43b909cc67a10f3a5fd1b21b2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d665034f239412927b1e71329f20f001c92da09 e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d665034f239412927b1e71329f20f001c92da09 cf7fc624329e76c6394653d12353e1d033adea91 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d665034f239412927b1e71329f20f001c92da09 1d324c2f43f70c965f25c58cc3611c779adbe47e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6d72628352c949629af619b77b042e0fb5245e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.16.12 4.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/ip6_gre.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"eca62bb0569de4d43a4dac06a2092a9d4ca1d702","status":"affected","version":"2d665034f239412927b1e71329f20f001c92da09","versionType":"git"},{"lessThan":"311fdd26eb4443d43b909cc67a10f3a5fd1b21b2","status":"affected","version":"2d665034f239412927b1e71329f20f001c92da09","versionType":"git"},{"lessThan":"e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82","status":"affected","version":"2d665034f239412927b1e71329f20f001c92da09","versionType":"git"},{"lessThan":"cf7fc624329e76c6394653d12353e1d033adea91","status":"affected","version":"2d665034f239412927b1e71329f20f001c92da09","versionType":"git"},{"lessThan":"1d324c2f43f70c965f25c58cc3611c779adbe47e","status":"affected","version":"2d665034f239412927b1e71329f20f001c92da09","versionType":"git"},{"status":"affected","version":"c6d72628352c949629af619b77b042e0fb5245e7","versionType":"git"},{"lessThan":"4.17","status":"affected","version":"4.16.12","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/ip6_gre.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.17"},{"lessThan":"4.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc3","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: Use cached t->net in ip6erspan_changelink().\n\nAfter commit 5e72ce3e3980 (\"net: ipv6: Use link netns in newlink() of\nrtnl_link_ops\"), ip6erspan_newlink() correctly resolves the per-netns\nip6gre hash via link_net. ip6erspan_changelink() was not converted in\nthat series and still uses dev_net(dev), which diverges from the\ndevice's creation netns after IFLA_NET_NS_FD migration.\n\nThis re-inserts the tunnel into the wrong per-netns hash. The\noriginal netns keeps a stale entry. When that netns is later\ndestroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a\nslab-use-after-free reported by KASAN, followed by a kernel BUG at\nnet/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net).\n\nip6gre_changelink() earlier in the same file already uses the cached\nt->net; only ip6erspan_changelink() has the wrong shape."}],"providerMetadata":{"dateUpdated":"2026-05-28T09:35:35.385Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702"},{"url":"https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2"},{"url":"https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82"},{"url":"https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91"},{"url":"https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e"}],"title":"ip6_gre: Use cached t->net in ip6erspan_changelink().","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46120","datePublished":"2026-05-28T09:35:35.385Z","dateReserved":"2026-05-13T15:03:33.098Z","dateUpdated":"2026-05-28T09:35:35.385Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:27","lastModifiedDate":"2026-05-28 13:44:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46120","Ordinal":"1","Title":"ip6_gre: Use cached t->net in ip6erspan_changelink().","CVE":"CVE-2026-46120","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46120","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: Use cached t->net in ip6erspan_changelink().\n\nAfter commit 5e72ce3e3980 (\"net: ipv6: Use link netns in newlink() of\nrtnl_link_ops\"), ip6erspan_newlink() correctly resolves the per-netns\nip6gre hash via link_net. ip6erspan_changelink() was not converted in\nthat series and still uses dev_net(dev), which diverges from the\ndevice's creation netns after IFLA_NET_NS_FD migration.\n\nThis re-inserts the tunnel into the wrong per-netns hash. The\noriginal netns keeps a stale entry. When that netns is later\ndestroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a\nslab-use-after-free reported by KASAN, followed by a kernel BUG at\nnet/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net).\n\nip6gre_changelink() earlier in the same file already uses the cached\nt->net; only ip6erspan_changelink() has the wrong shape.","Type":"Description","Title":"ip6_gre: Use cached t->net in ip6erspan_changelink()."}]}}}