CVE-2026-72136 (GCVE-0-2026-72136)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-08-17 05:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: xfrm_interface: require CAP_NET_ADMIN in the device netns for changelink
xfrmi_changelink() operates on at most two netns, dev_net(dev) and the
interface link netns xi->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 xi->net can rewrite an interface that
lives in xi->net.
Gate xfrmi_changelink() on rtnl_dev_link_net_capable() at its top,
before any attribute is parsed.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e Version: f203b76d78092faf248db3f851840fbecf80b40e |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_interface_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "04c1aa57d08471b1953bf27c84ac9b3d78d71831",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
"lessThan": "bdfd1c21d90e628a58a9de79e024cdfcbedfa15c",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
"lessThan": "80ec68bba11f7f387c0e4099c2d7b2c84943eb99",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
"lessThan": "e9c90756f10da334fb31552e52c61f1dba69f491",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
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"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
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"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
"lessThan": "3ba2b2ef7d6a63b190f15cfc2b4ba0fba59928ea",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
},
{
"lessThan": "095515d89b19b6cc19dfcdc846f97403ed1ebce3",
"status": "affected",
"version": "f203b76d78092faf248db3f851840fbecf80b40e",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_interface_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"lessThan": "4.19",
"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": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: xfrm_interface: require CAP_NET_ADMIN in the device netns for changelink\n\nxfrmi_changelink() operates on at most two netns, dev_net(dev) and the\ninterface link netns xi-\u003enet. They differ once the device is created in\nor moved 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 xi-\u003enet can rewrite an interface that\nlives in xi-\u003enet.\n\nGate xfrmi_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 a local RTM_NEWLINK changelink over an rtnetlink/netlink socket (rtnl_newlink \u2192 rtnl_changelink \u2192 xfrmi_changelink); this is a netlink configuration path, not remote packet handling, matching kernel Local guidance.\nAC:L - Once a cross-namespace xfrmi exists (dev_net(dev) \u2260 xi-\u003enet via IFLA_LINK_NETNSID creation or netns migration), bypassing the missing check is one deterministic changelink with attacker-chosen IFLA_XFRM_IF_ID; no race, timing, or layout dependency.\nPR:L - rtnl_link_get_net_capable() only requires CAP_NET_ADMIN in dev_net(dev), obtainable by an unprivileged user via user+network namespaces (unshare -Urn / map-root-user); CAP_NET_ADMIN in the sticky link netns xi-\u003enet is not required.\nUI:N - The attack is fully programmatic from the attacker\u0027s own process through netlink; no victim action such as mounting a filesystem, opening a file, or clicking is required.\nS:C - Privilege is checked against dev_net(dev) while xfrmi_changelink/xfrmi_update mutate live xfrm interface state in xi-\u003enet (hash unlink/relink, if_id binding), crossing from the attacker\u0027s net/user namespace into another tenant\u0027s or the host network namespace.\nC:H - Changing IFLA_XFRM_IF_ID in xi-\u003enet retargets xfrmi_lookup/xfrm_lookup_with_ifid so host IPsec SAs can deliver decrypted VPN cleartext to the attacker-controlled netdev in dev_net(dev), exposing confidential tunneled traffic.\nI:H - Unauthorized changelink rewrites live xfrm interface parameters and xi-\u003enet registration, enabling redirection or injection of IPsec encapsulation/decapsulation paths on Internet-facing VPN gateways and cloud IPsec endpoints.\nA:H - xfrmi_update() runs synchronize_net() and netdev_state_change(); breaking or rebinding if_id mapping disrupts production IPsec/VTI/xfrmi VPN paths, causing sustained loss of encrypted tunnel connectivity."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:40:46.616Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/04c1aa57d08471b1953bf27c84ac9b3d78d71831"
},
{
"url": "https://git.kernel.org/stable/c/bdfd1c21d90e628a58a9de79e024cdfcbedfa15c"
},
{
"url": "https://git.kernel.org/stable/c/80ec68bba11f7f387c0e4099c2d7b2c84943eb99"
},
{
"url": "https://git.kernel.org/stable/c/e9c90756f10da334fb31552e52c61f1dba69f491"
},
{
"url": "https://git.kernel.org/stable/c/37b61946d278c7deb0d40ba8f2b6fc0478d61dab"
},
{
"url": "https://git.kernel.org/stable/c/8ca2a19a987a7d1cb4c916ed9723a1c6993b4276"
},
{
"url": "https://git.kernel.org/stable/c/3ba2b2ef7d6a63b190f15cfc2b4ba0fba59928ea"
},
{
"url": "https://git.kernel.org/stable/c/095515d89b19b6cc19dfcdc846f97403ed1ebce3"
}
],
"title": "xfrm: xfrm_interface: 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-2026-72136",
"datePublished": "2026-08-15T05:53:11.072Z",
"dateReserved": "2026-08-09T03:40:39.908Z",
"dateUpdated": "2026-08-17T05:40:46.616Z",
"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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