{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72061","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.903Z","datePublished":"2026-08-15T05:52:15.823Z","dateUpdated":"2026-08-17T05:39:54.286Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:39:54.286Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sit: require CAP_NET_ADMIN in the device netns for changelink\n\nipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed. sit was the one tunnel type not covered\nby the recent series that added this check to the other changelink()\nhandlers."}],"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/RTM_SETLINK changelink over a local rtnetlink socket; ipip6_changelink is only reachable from rtnl configuration, not from received IPv4/IPv6 packets processed by ipip6_rcv.\nAC:L - Once a SIT device exists with t->net differing from dev_net(dev) (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 ipip6_changelink mutates tunnel state in t->net via ipip6_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 IPv6-in-IPv4 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 link, encap ports, and 6rd prefix/relay settings in t->net, enabling redirection and injection of IPv6 traffic carried over the SIT tunnel.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or 6rd parameters breaks 6to4, 6rd, and cross-netns IPv6 connectivity, causing sustained loss of service for every workload depending on the affected SIT tunnel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/sit.c"],"versions":[{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"cb41b308e9d867725d965b291dd085028e36a480","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"c5a0ae895432596b2f464172da8218e2d84e2932","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"7d139dec96691cde96cb40ed293e2d13d994fb4f","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"388ccffbd2e7e5e4271f291085a7451865705305","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"c0ea1aedb37bb979e864ed7787975434bbd9db73","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"3118e97dae533fb45964b87bbed1801afcff7c65","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"99ae3248b33df94201915d9c32e7470cdf08cfcd","status":"affected","versionType":"git"},{"version":"5e6700b3bf98fe98d630bf9c939ad4c85ce95592","lessThan":"27ccb68e7cccead5d8c611665a45d23032d468b3","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/ipv6/sit.c"],"versions":[{"version":"3.11","status":"affected"},{"version":"0","lessThan":"3.11","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":"3.11","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.11","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cb41b308e9d867725d965b291dd085028e36a480"},{"url":"https://git.kernel.org/stable/c/c5a0ae895432596b2f464172da8218e2d84e2932"},{"url":"https://git.kernel.org/stable/c/7d139dec96691cde96cb40ed293e2d13d994fb4f"},{"url":"https://git.kernel.org/stable/c/388ccffbd2e7e5e4271f291085a7451865705305"},{"url":"https://git.kernel.org/stable/c/c0ea1aedb37bb979e864ed7787975434bbd9db73"},{"url":"https://git.kernel.org/stable/c/3118e97dae533fb45964b87bbed1801afcff7c65"},{"url":"https://git.kernel.org/stable/c/99ae3248b33df94201915d9c32e7470cdf08cfcd"},{"url":"https://git.kernel.org/stable/c/27ccb68e7cccead5d8c611665a45d23032d468b3"}],"title":"net: sit: require CAP_NET_ADMIN in the device netns for changelink","x_generator":{"engine":"bippy-1.2.0"}}}}