{ "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": "2026-10-16T15:53:18.394Z" }, "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-72054", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:50:59.364061Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:18.394Z" } } ] } }