CVE-2026-72052 (GCVE-0-2026-72052)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-17 05:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink
ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their top, before any
attribute is parsed.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: 690afc165bb314354667f67157c1a1aea7dc797a Version: d0201d2405dac8d9b16773e97709925e397552d0 Version: 7943bb0f06365cf5e32f3cf8a6b29eeae981fb8a Version: 4.19.100 ≤ Version: 5.4.16 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv6/ip6_gre.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "129f8939e5af683cec3a1a5edcb40a64636ad81e",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "e3724dedf57761c6de52f4d604ec74f66fd61611",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "220162c9fedbe992da70d70f50a10da4f45f914c",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "1d4d8ee002083ca4ead5353662bf8362428af57f",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "0caa9f348f8b5356900de77b0bb89a697c4aff20",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "03d8843b143ebbbfaf48511922abc6e886575a61",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "c38c8b0db3c65b597e7ece317b6cb59de3d15e69",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"lessThan": "f00a50876d2818bd6dc86fa98b3ef360884c53c8",
"status": "affected",
"version": "690afc165bb314354667f67157c1a1aea7dc797a",
"versionType": "git"
},
{
"status": "affected",
"version": "d0201d2405dac8d9b16773e97709925e397552d0",
"versionType": "git"
},
{
"status": "affected",
"version": "7943bb0f06365cf5e32f3cf8a6b29eeae981fb8a",
"versionType": "git"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.100",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.16",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv6/ip6_gre.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"lessThan": "5.5",
"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19.100",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink\n\nip6gre_changelink() and ip6erspan_changelink() operate on at most two\nnetns, dev_net(dev) and the tunnel link netns t-\u003enet. They differ once\nthe device is created in or moved to a netns other than the one the\nrequest runs in. The rtnl changelink path checks CAP_NET_ADMIN only\nagainst dev_net(dev), so a caller privileged there but not in t-\u003enet can\nrewrite a tunnel that lives in t-\u003enet.\n\nGate both ops on rtnl_dev_link_net_capable() at their top, before any\nattribute 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 - The bug is reached only via rtnetlink (RTM_NEWLINK changelink) on a local NETLINK_ROUTE socket, not by processing attacker-controlled network packets; kernel guidance classifies rtnetlink control-plane bugs as Local.\nAC:L - With CAP_NET_ADMIN in dev_net(dev) (e.g. via user namespaces), an attacker can move a cross-netns ip6gre device or use an existing one, then issue a single deterministic changelink; no uncontrollable races or rare kernel configs are required.\nPR:L - Exploitation requires CAP_NET_ADMIN in dev_net(dev) to issue RTM_NEWLINK changelink; this capability is available to unprivileged users creating user+network namespaces (unshare -Urn), not only real init-namespace root.\nUI:N - No victim interaction is needed once the attacker has a suitable ip6gre/ip6gretap/ip6erspan netdev handle and issues rtnetlink changelink requests to rewrite tunnel parameters.\nS:C - The flaw crosses the network-namespace security boundary: a caller authorized only in dev_net(dev) can modify ip6gre state and routing tables in t-\u003enet (another tenant/host namespace), violating netns isolation relied on by containers and Kubernetes.\nC:H - changelink can point tunnels/ERSPAN mirroring at attacker-chosen IPv6 endpoints and keys, enabling interception and collection of traffic that other namespaces expect to be privately encapsulated or mirrored only to trusted collectors.\nI:H - The attacker can arbitrarily rewrite tunnel link parameters (local/remote addresses, keys, encap, fwmark, ERSPAN index) and rehash tunnel state in the victim link netns, redirecting or corrupting network paths outside their authorization.\nA:H - Rewriting or unlinking tunnel entries can immediately break GRE/ERSPAN connectivity depended on for production links, causing sustained network outage or repeated loss of availability without kernel interaction from the victim."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:39:48.851Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e"
},
{
"url": "https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611"
},
{
"url": "https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c"
},
{
"url": "https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f"
},
{
"url": "https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20"
},
{
"url": "https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61"
},
{
"url": "https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69"
},
{
"url": "https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8"
}
],
"title": "net: ip6_gre: 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-2026-72052",
"datePublished": "2026-08-15T05:52:09.194Z",
"dateReserved": "2026-08-09T03:40:39.902Z",
"dateUpdated": "2026-08-17T05:39:48.851Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
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.
Loading…
Loading…