{ "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": "2026-10-16T15:53:18.082Z" }, "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-72052", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:50:53.707122Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:18.082Z" } } ] } }