{ "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": "2026-10-16T15:53:18.844Z" }, "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-72061", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:51:08.793068Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:18.844Z" } } ] } }