CVE-2026-72055

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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 vti6_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 - The flaw is only reachable through rtnetlink configuration (RTM_NEWLINK changelink via netlink socket), not from remote IPv6/IPsec packets processed by vti6_rcv; kernel guidance classifies netlink/tc paths as Local.\nAC:L - Exploitation is a deterministic attacker-controlled sequence (create vti6, move netns so dev_net(dev) != t->net, issue changelink) with no races, timing dependencies, or uncontrollable victim state once the cross-namespace device exists.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN in dev_net(dev), obtainable by an unprivileged local user inside a user+network namespace (unshare --user --map-root-user --net) without init-namespace root or CAP_NET_ADMIN in t->net.\nUI:N - Exploitation 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 - vti6_changelink mutates live tunnel state and hash tables in t->net while authorization is checked only against dev_net(dev), crossing from the attacker's net/user namespace into another tenant's or the host's network namespace IPsec tunnel configuration.\nC:H - Unauthorized changelink can rewrite IFLA_VTI_LOCAL/REMOTE, IKEY/OKEY, and FWMARK to redirect IPv6 IPsec VTI traffic through attacker-controlled endpoints, exposing decrypted tunneled payloads on the receive path.\nI:H - The attacker can arbitrarily reconfigure live vti6 tunnel endpoints, keys, link binding, and routing metadata in t->net without authorization, enabling traffic redirection and injection across the victim namespace's IPsec VPN paths.\nA:H - Rewriting or invalidating vti6 tunnel endpoints, keys, or link configuration can break production IPsec VPN overlays and dependent services, causing sustained loss of connectivity for workloads in the victim network namespace."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_vti.c"], "versions": [{"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "f5254e7766b4ac02b66b2ccef896cd278503cb11", "status": "affected", "versionType": "git"}, {"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "ef897249dc957089e6f7f11ceea699e093ad51bd", "status": "affected", "versionType": "git"}, {"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba", "status": "affected", "versionType": "git"}, 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CAP_NET_ADMIN in the device netns for changelink", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72055", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:51:02.327568Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862 Missing Authorization"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T21:19:25.382Z"}}]}}

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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 vti6_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 - The flaw is only reachable through rtnetlink configuration (RTM_NEWLINK changelink via netlink socket), not from remote IPv6/IPsec packets processed by vti6_rcv; kernel guidance classifies netlink/tc paths as Local.\nAC:L - Exploitation is a deterministic attacker-controlled sequence (create vti6, move netns so dev_net(dev) != t->net, issue changelink) with no races, timing dependencies, or uncontrollable victim state once the cross-namespace device exists.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN in dev_net(dev), obtainable by an unprivileged local user inside a user+network namespace (unshare --user --map-root-user --net) without init-namespace root or CAP_NET_ADMIN in t->net.\nUI:N - Exploitation 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 - vti6_changelink mutates live tunnel state and hash tables in t->net while authorization is checked only against dev_net(dev), crossing from the attacker's net/user namespace into another tenant's or the host's network namespace IPsec tunnel configuration.\nC:H - Unauthorized changelink can rewrite IFLA_VTI_LOCAL/REMOTE, IKEY/OKEY, and FWMARK to redirect IPv6 IPsec VTI traffic through attacker-controlled endpoints, exposing decrypted tunneled payloads on the receive path.\nI:H - The attacker can arbitrarily reconfigure live vti6 tunnel endpoints, keys, link binding, and routing metadata in t->net without authorization, enabling traffic redirection and injection across the victim namespace's IPsec VPN paths.\nA:H - Rewriting or invalidating vti6 tunnel endpoints, keys, or link configuration can break production IPsec VPN overlays and dependent services, causing sustained loss of connectivity for workloads in the victim network namespace."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_vti.c"], "versions": [{"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "f5254e7766b4ac02b66b2ccef896cd278503cb11", "status": "affected", "versionType": "git"}, {"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "ef897249dc957089e6f7f11ceea699e093ad51bd", "status": "affected", "versionType": "git"}, {"version": "61220ab349485d911083d0b7990ccd3db6c63297", "lessThan": "f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba", "status": "affected", "versionType": "git"}, 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/ip6_vti.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f5254e7766b4ac02b66b2ccef896cd278503cb11", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "ef897249dc957089e6f7f11ceea699e093ad51bd", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "c64b9ae7eb97e81d54b792910a3aeafd92566c79", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "0b2f9c908f930ec4be17d389723f9a202d6a883c", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "f97e93ebf2f9b8ef3b87f7a9371255e84d151587", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}, {"lessThan": "e2ac3b242c37dff323a964962e43854f4b1a2b79", "status": "affected", "version": "61220ab349485d911083d0b7990ccd3db6c63297", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/ip6_vti.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.15"}, {"lessThan": "3.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink\n\nvti6_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 vti6_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."}], "id": "CVE-2026-72055", "lastModified": "2026-10-19T22:17:24.623", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72055", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:51:02.327568Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:14.890", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b2f9c908f930ec4be17d389723f9a202d6a883c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c64b9ae7eb97e81d54b792910a3aeafd92566c79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e2ac3b242c37dff323a964962e43854f4b1a2b79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef897249dc957089e6f7f11ceea699e093ad51bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5254e7766b4ac02b66b2ccef896cd278503cb11"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f97e93ebf2f9b8ef3b87f7a9371255e84d151587"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink", "id": "2516421", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516421"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-270", "details": ["A flaw was found in the Linux kernel's `ip6_vti` component, which handles IPv6 Virtual Tunnel Interfaces. A local attacker with certain network administration privileges in one isolated network environment (network namespace) could exploit this vulnerability. This allows them to modify the configuration of a tunnel in a different isolated network environment where they do not have full administrative rights, potentially leading to unauthorized network changes or the redirection of network traffic."], "name": "CVE-2026-72055", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72055\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72055\nhttps://lore.kernel.org/linux-cve-announce/2026081516-CVE-2026-72055-41c4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,f5254e7766b4ac02b66b2ccef896cd278503cb11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,ef897249dc957089e6f7f11ceea699e093ad51bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,c64b9ae7eb97e81d54b792910a3aeafd92566c79)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,0b2f9c908f930ec4be17d389723f9a202d6a883c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,f97e93ebf2f9b8ef3b87f7a9371255e84d151587)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,e2ac3b242c37dff323a964962e43854f4b1a2b79)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T08:45:05.632016+00:00", "updated": "2026-10-20T13:00:12.993503+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}