{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72052","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.902Z","datePublished":"2026-08-15T05:52:09.194Z","dateUpdated":"2026-08-17T05:39:48.851Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:39:48.851Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink\n\nip6gre_changelink() and ip6erspan_changelink() operate on at most two\nnetns, dev_net(dev) and the tunnel link netns t->net. They differ once\nthe device is created in or moved to a netns other than the one the\nrequest runs in. The rtnl changelink path checks CAP_NET_ADMIN only\nagainst dev_net(dev), so a caller privileged there but not in t->net can\nrewrite a tunnel that lives in t->net.\n\nGate both ops on rtnl_dev_link_net_capable() at their top, before any\nattribute 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 - The bug is reached only via rtnetlink (RTM_NEWLINK changelink) on a local NETLINK_ROUTE socket, not by processing attacker-controlled network packets; kernel guidance classifies rtnetlink control-plane bugs as Local.\nAC:L - With CAP_NET_ADMIN in dev_net(dev) (e.g. via user namespaces), an attacker can move a cross-netns ip6gre device or use an existing one, then issue a single deterministic changelink; no uncontrollable races or rare kernel configs are required.\nPR:L - Exploitation requires CAP_NET_ADMIN in dev_net(dev) to issue RTM_NEWLINK changelink; this capability is available to unprivileged users creating user+network namespaces (unshare -Urn), not only real init-namespace root.\nUI:N - No victim interaction is needed once the attacker has a suitable ip6gre/ip6gretap/ip6erspan netdev handle and issues rtnetlink changelink requests to rewrite tunnel parameters.\nS:C - The flaw crosses the network-namespace security boundary: a caller authorized only in dev_net(dev) can modify ip6gre state and routing tables in t->net (another tenant/host namespace), violating netns isolation relied on by containers and Kubernetes.\nC:H - changelink can point tunnels/ERSPAN mirroring at attacker-chosen IPv6 endpoints and keys, enabling interception and collection of traffic that other namespaces expect to be privately encapsulated or mirrored only to trusted collectors.\nI:H - The attacker can arbitrarily rewrite tunnel link parameters (local/remote addresses, keys, encap, fwmark, ERSPAN index) and rehash tunnel state in the victim link netns, redirecting or corrupting network paths outside their authorization.\nA:H - Rewriting or unlinking tunnel entries can immediately break GRE/ERSPAN connectivity depended on for production links, causing sustained network outage or repeated loss of availability without kernel interaction from the victim."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ip6_gre.c"],"versions":[{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"129f8939e5af683cec3a1a5edcb40a64636ad81e","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"e3724dedf57761c6de52f4d604ec74f66fd61611","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"220162c9fedbe992da70d70f50a10da4f45f914c","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"1d4d8ee002083ca4ead5353662bf8362428af57f","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"0caa9f348f8b5356900de77b0bb89a697c4aff20","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"03d8843b143ebbbfaf48511922abc6e886575a61","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"c38c8b0db3c65b597e7ece317b6cb59de3d15e69","status":"affected","versionType":"git"},{"version":"690afc165bb314354667f67157c1a1aea7dc797a","lessThan":"f00a50876d2818bd6dc86fa98b3ef360884c53c8","status":"affected","versionType":"git"},{"version":"d0201d2405dac8d9b16773e97709925e397552d0","status":"affected","versionType":"git"},{"version":"7943bb0f06365cf5e32f3cf8a6b29eeae981fb8a","status":"affected","versionType":"git"},{"version":"4.19.100","lessThan":"4.20","status":"affected","versionType":"semver"},{"version":"5.4.16","lessThan":"5.5","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ip6_gre.c"],"versions":[{"version":"5.5","status":"affected"},{"version":"0","lessThan":"5.5","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":"5.5","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.100"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e"},{"url":"https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611"},{"url":"https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c"},{"url":"https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f"},{"url":"https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20"},{"url":"https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61"},{"url":"https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69"},{"url":"https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8"}],"title":"net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink","x_generator":{"engine":"bippy-1.2.0"}}}}