{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72136",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72136"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "xfrm: xfrm_interface: require CAP_NET_ADMIN in the device netns for changelink",
  "details": "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->net. 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->net can rewrite an interface that\nlives in xi->net.\n\nGate xfrmi_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72136"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04c1aa57d08471b1953bf27c84ac9b3d78d71831"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bdfd1c21d90e628a58a9de79e024cdfcbedfa15c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/80ec68bba11f7f387c0e4099c2d7b2c84943eb99"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e9c90756f10da334fb31552e52c61f1dba69f491"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37b61946d278c7deb0d40ba8f2b6fc0478d61dab"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ca2a19a987a7d1cb4c916ed9723a1c6993b4276"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ba2b2ef7d6a63b190f15cfc2b4ba0fba59928ea"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/095515d89b19b6cc19dfcdc846f97403ed1ebce3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "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->net 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->net is not required.\nUI:N - The attack is fully programmatic from the attacker's 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->net (hash unlink/relink, if_id binding), crossing from the attacker's net/user namespace into another tenant's or the host network namespace.\nC:H - Changing IFLA_XFRM_IF_ID in xi->net 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->net 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."
    }
  }
}