{"id":"CVE-2026-72053","state":"PUBLISHED","title":"net: ipip: require CAP_NET_ADMIN in the device netns for changelink","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipip: require CAP_NET_ADMIN in the device netns for changelink\n\nipip_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t->net. They differ once the device is created in or\nmoved to a netns other than the one the request runs in. The rtnl\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a\ncaller privileged there but not in t->net can rewrite a tunnel that\nlives in t->net.\n\nGate ipip_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed.","publishedAt":"2026-08-15T05:52:09.924Z","updatedAt":"2026-10-19T21:19:25.074Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"a7d2642a50282322bc33f34ee7305f2b793df494","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"068ad9b85f681755f751ebab82ae98146cec163d","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"91571643e554ae89a91942380d5f5361fb7060a2","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"983cc4aa7e6f633b34c3ee743771252d7afa9a90","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"26544021d5c49cc6ae8a968ccb5033e6363854a4","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"68cadc3698c7de88966d306d12ec9c6217da228a","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"d49edcc65e0a37cc9b386a94415c5d6670ca8b71","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"8211a26324667980a463c069469a818e71207e02","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ipip.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ipip.c"]}],"references":["https://git.kernel.org/stable/c/a7d2642a50282322bc33f34ee7305f2b793df494","https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d","https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2","https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90","https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4","https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a","https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71","https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72053.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72053","state":"PUBLISHED","datePublished":"2026-08-15T05:52:09.924Z","dateUpdated":"2026-10-19T21:19:25.074Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.902Z"},"containers":{"cna":{"title":"net: ipip: require CAP_NET_ADMIN in the device netns for changelink","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipip: require CAP_NET_ADMIN in the device netns for changelink\n\nipip_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t->net. They differ once the device is created in or\nmoved to a netns other than the one the request runs in. The rtnl\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a\ncaller privileged there but not in t->net can rewrite a tunnel that\nlives in t->net.\n\nGate ipip_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"a7d2642a50282322bc33f34ee7305f2b793df494","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"068ad9b85f681755f751ebab82ae98146cec163d","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"91571643e554ae89a91942380d5f5361fb7060a2","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"983cc4aa7e6f633b34c3ee743771252d7afa9a90","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"26544021d5c49cc6ae8a968ccb5033e6363854a4","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"68cadc3698c7de88966d306d12ec9c6217da228a","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"d49edcc65e0a37cc9b386a94415c5d6670ca8b71","versionType":"git"},{"version":"6c742e714d8c282fd8f8b22d3e20b5141738c1ee","status":"affected","lessThan":"8211a26324667980a463c069469a818e71207e02","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ipip.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ipip.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a7d2642a50282322bc33f34ee7305f2b793df494"},{"url":"https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d"},{"url":"https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2"},{"url":"https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90"},{"url":"https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4"},{"url":"https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a"},{"url":"https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71"},{"url":"https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02"}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires RTM_NEWLINK changelink over a local rtnetlink socket; ipip_changelink is only reachable from rtnl configuration, not from received IPv4/MPLS packets processed by ipip_rcv.\nAC:L - Once an IPIP device exists with t->net differing from dev_net(dev) via IFLA_LINK_NETNSID newlink or IFLA_NET_NS_FD migration, a single deterministic netlink changelink bypasses the missing check with no race or memory-layout dependency.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN only in dev_net(dev), obtainable by an unprivileged local user via unshare --user --map-root-user --net; no CAP_NET_ADMIN in the sticky link netns t->net is required.\nUI:N - The attack is fully programmatic through netlink from the attacker's own process; no victim action such as mounting a filesystem, opening a file, or clicking is required.\nS:C - Authorization is checked against dev_net(dev) while ipip_changelink mutates tunnel state in t->net via ip_tunnel_changelink/ip_tunnel_update, crossing from the attacker's net/user namespace into another tenant's or the host's network namespace.\nC:H - An attacker can rewrite IFLA_IPTUN_LOCAL/REMOTE, link, fwmark, and encap parameters to redirect IPv4-in-IPv4/MPLS traffic to an attacker-controlled endpoint and read all tunneled payloads in the victim link netns.\nI:H - Unauthorized changelink updates live tunnel endpoints, underlay netdev, encap ports, and fwmark in t->net, enabling redirection and injection of encapsulated IPv4/MPLS traffic across the namespace boundary.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or encap parameters breaks IPIP/MPLS overlay connectivity, causing sustained loss of service for every workload depending on the affected tunnel."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:46:35.344Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72053","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:50:56.854683Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","type":"CWE","description":"CWE-862 Missing Authorization"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:19:25.074Z"}}]}}}