CVE-2026-72053 (GCVE-0-2026-72053)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-23 12:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ipip: require CAP_NET_ADMIN in the device netns for changelink
ipip_changelink() operates on at most two netns, dev_net(dev) and the
tunnel link netns t->net. They differ once the device is created in or
moved to a netns other than the one the request runs in. The rtnl
changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a
caller privileged there but not in t->net can rewrite a tunnel that
lives in t->net.
Gate ipip_changelink() on rtnl_dev_link_net_capable() at its top,
before any attribute is parsed.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee Version: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv4/ipip.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a7d2642a50282322bc33f34ee7305f2b793df494",
"status": "affected",
"version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
"versionType": "git"
},
{
"lessThan": "068ad9b85f681755f751ebab82ae98146cec163d",
"status": "affected",
"version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
"versionType": "git"
},
{
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"status": "affected",
"version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
"versionType": "git"
},
{
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"status": "affected",
"version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
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{
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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]
},
{
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"product": "Linux",
"programFiles": [
"net/ipv4/ipip.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.12"
},
{
"lessThan": "3.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.266",
"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.217",
"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "3.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "3.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipip: require CAP_NET_ADMIN in the device netns for changelink\n\nipip_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t-\u003enet. 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-\u003enet can rewrite a tunnel that\nlives in t-\u003enet.\n\nGate ipip_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires RTM_NEWLINK changelink over a local rtnetlink socket; ipip_changelink is only reachable from rtnl configuration, not from received IPv4/MPLS packets processed by ipip_rcv.\nAC:L - Once an IPIP device exists with t-\u003enet differing from dev_net(dev) via 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-\u003enet is required.\nUI:N - The attack is fully programmatic through netlink from the attacker\u0027s 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 ipip_changelink mutates tunnel state in t-\u003enet via ip_tunnel_changelink/ip_tunnel_update, crossing from the attacker\u0027s net/user namespace into another tenant\u0027s or the host\u0027s network namespace.\nC:H - An attacker can rewrite IFLA_IPTUN_LOCAL/REMOTE, link, fwmark, and encap parameters to redirect IPv4-in-IPv4/MPLS 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 netdev, encap ports, and fwmark in t-\u003enet, enabling redirection and injection of encapsulated IPv4/MPLS traffic across the namespace boundary.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or encap parameters breaks IPIP/MPLS overlay connectivity, causing sustained loss of service for every workload depending on the affected tunnel."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:46:35.344Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a7d2642a50282322bc33f34ee7305f2b793df494"
},
{
"url": "https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d"
},
{
"url": "https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2"
},
{
"url": "https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90"
},
{
"url": "https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4"
},
{
"url": "https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a"
},
{
"url": "https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71"
},
{
"url": "https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02"
}
],
"title": "net: ipip: require CAP_NET_ADMIN in the device netns for changelink",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72053",
"datePublished": "2026-08-15T05:52:09.924Z",
"dateReserved": "2026-08-09T03:40:39.902Z",
"dateUpdated": "2026-08-23T12:46:35.344Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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