{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72054","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.903Z","datePublished":"2026-08-15T05:52:10.679Z","dateUpdated":"2026-08-17T05:39:51.024Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:39:51.024Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_vti: require CAP_NET_ADMIN in the device netns for changelink\n\nvti_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 vti_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."}],"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; vti_changelink is only reachable from rtnl configuration, not from received IPsec or IPv4 packets handled by vti_input/vti_rcv_proto.\nAC:L - Once a VTI device exists with t->net differing from dev_net(dev) via IFLA_NET_NS_FD migration or IFLA_LINK_NETNSID newlink, 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 vti_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_VTI_LOCAL/REMOTE, i_key/o_key, link, and fwmark to redirect IPsec VTI traffic to an attacker-controlled endpoint, exposing decrypted inner payloads carried by the VPN tunnel in the victim link netns.\nI:H - Unauthorized changelink updates live VTI tunnel endpoints, IPsec keys, underlay netdev, and fwmark in t->net, enabling redirection and injection of IPsec-protected traffic across the namespace boundary.\nA:H - Rewriting tunnel remote/local addresses, IPsec keys, or the underlay link breaks site-to-site IPsec VPN connectivity, causing sustained loss of service for every workload depending on the affected VTI tunnel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ip_vti.c"],"versions":[{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"1caf737e625143c6f23c32d2b747b1a3e42e5699","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"32edf8aa297745226854eda2d96c0fac66c1bb15","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"973ead9e565423642e4533e1547b5d2c0476fb03","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"33fd93961557ec8e3e9958995b28684c5f949394","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"6d8bc0dc99472d62c57c2a3d436e6ab408592bda","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"9571af2eec8023af9a1671b7f2cd4ab400011724","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"88b33ee458a6ca5fbef6c53b9dba772da69dab68","status":"affected","versionType":"git"},{"version":"895de9a3488abcdd186680f0af3cce7f2d4d4a6e","lessThan":"95cceadbfd52d7239bd730afdda0655287d77425","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/ip_vti.c"],"versions":[{"version":"3.15","status":"affected"},{"version":"0","lessThan":"3.15","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1caf737e625143c6f23c32d2b747b1a3e42e5699"},{"url":"https://git.kernel.org/stable/c/32edf8aa297745226854eda2d96c0fac66c1bb15"},{"url":"https://git.kernel.org/stable/c/973ead9e565423642e4533e1547b5d2c0476fb03"},{"url":"https://git.kernel.org/stable/c/33fd93961557ec8e3e9958995b28684c5f949394"},{"url":"https://git.kernel.org/stable/c/6d8bc0dc99472d62c57c2a3d436e6ab408592bda"},{"url":"https://git.kernel.org/stable/c/9571af2eec8023af9a1671b7f2cd4ab400011724"},{"url":"https://git.kernel.org/stable/c/88b33ee458a6ca5fbef6c53b9dba772da69dab68"},{"url":"https://git.kernel.org/stable/c/95cceadbfd52d7239bd730afdda0655287d77425"}],"title":"net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink","x_generator":{"engine":"bippy-1.2.0"}}}}