{"id":"CVE-2026-46120","revision":null,"records":[{"revision":"92db4d0fccf74a0083dad0b292aa1f0f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46120","aliases":[],"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":0,"publishedAt":"2026-05-28T09:35:35.385+00:00","modifiedAt":"2026-10-19T19:36:51.221+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_gre.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"7bd0f2b162b426b343a114e1b329f0d8d14fdc6e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"01b71ff2857d3598337de11e7840a8e3ff21553c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"0fcf6731706f73494245a9c0d64f93bebf95bb51\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"eca62bb0569de4d43a4dac06a2092a9d4ca1d702\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"311fdd26eb4443d43b909cc67a10f3a5fd1b21b2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"cf7fc624329e76c6394653d12353e1d033adea91\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2d665034f239412927b1e71329f20f001c92da09\",\n \"lessThan\": \"1d324c2f43f70c965f25c58cc3611c779adbe47e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"c6d72628352c949629af619b77b042e0fb5245e7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4.16.12\",\n \"lessThan\": \"4.17\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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_gre.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.17\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.17\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.140\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.88\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.30\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.7\",\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:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e","https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c","https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51","https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702","https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2","https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82","https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91","https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46120","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46120","identifiers":["CVE-2026-46120"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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