{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72055", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.903Z", "datePublished": "2026-08-15T05:52:11.413Z", "dateUpdated": "2026-10-16T15:53:18.538Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:39:52.104Z"}, "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."}], "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), 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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": "2026-10-16T16:20:57.713", "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"}

{"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"}

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