{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63914",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63914"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "xfrm: route MIGRATE notifications to caller's netns",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: route MIGRATE notifications to caller's netns\n\nxfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate()\nin net/key/af_key.c both hardcode &init_net for the multicast that\nannounces a successful XFRM_MSG_MIGRATE / SADB_X_MIGRATE.\n\nXFRM_MSG_MIGRATE arrives on a per-netns NETLINK_XFRM socket, and the\nrest of the xfrm/af_key netlink path was made netns-aware in 2008.\nThe other 14 multicast paths in xfrm_user.c route their event using\nxs_net(x), xp_net(xp) or sock_net(skb->sk); only the migrate path\nwas missed.\n\nTwo consequences of the init_net hardcoding:\n\n  1. The notification (selector, old/new endpoint addresses, and the\n     km_address) is delivered to listeners on init_net's\n     XFRMNLGRP_MIGRATE / pfkey BROADCAST_ALL groups rather than on\n     the issuing netns. An IKE daemon running in init_net therefore\n     receives migration notifications originating from any other\n     netns on the host.\n\n  2. An IKE daemon running inside a non-init netns and subscribed\n     to its own XFRMNLGRP_MIGRATE / pfkey groups never receives the\n     notification of its own migration. IKEv2 MOBIKE / address-update\n     handling inside a netns is silently broken.\n\nThread struct net through km_migrate() and the xfrm_mgr.migrate\nfunction pointer, drop the &init_net override in xfrm_send_migrate()\nand pfkey_send_migrate(), and pass the caller's net (already in\nscope in xfrm_migrate() via sock_net(skb->sk)) all the way down.\nstruct xfrm_mgr is in-tree only and not exported as a stable API,\nso the function-pointer signature change is internal.\n\npfkey_broadcast() is already netns-aware via net_generic(net,\npfkey_net_id) since the pernet conversion. The five other\npfkey_broadcast() callers in af_key.c already pass xs_net(x),\nsock_net(sk) or a per-netns net, so this only removes the\n&init_net outlier.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L"
    }
  ],
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached only through local NETLINK_XFRM or PF_KEY sockets (xfrm_do_migrate/pfkey_migrate); there is no network packet receive path to xfrm_migrate().\nAC:L - Once IPsec policies and SAs exist (which a CAP_NET_ADMIN caller can create), a successful migrate reliably multicasts the notification; a listener in init_net receives cross-namespace events without winning a race or depending on attacker-uncontrollable state.\nPR:L - Both triggering XFRM_MSG_MIGRATE/SADB_X_MIGRATE and subscribing to XFRMNLGRP_MIGRATE require CAP_NET_ADMIN, which is obtainable in a user namespace (e.g. unshare -U while remaining in init_net) without real root in the init user namespace.\nUI:N - Exploitation requires no victim user action beyond normal background IPsec/MOBIKE operation; the attacker passively listens for migrate notifications.\nS:C - The flaw breaks network-namespace isolation by delivering per-netns IPsec migration notifications to init_net listeners, crossing the security boundary between isolated network namespaces and the host namespace.\nC:H - Successful exploitation discloses sensitive IPsec/MOBIKE data\u2014traffic selectors, old/new tunnel endpoint addresses, and km_address negotiation endpoints\u2014from victim network namespaces to unauthorized init_net listeners.\nI:N - The bug only misroutes multicast notifications; it does not modify kernel memory, IPsec state, or any data beyond the intended migration operation itself.\nA:L - The complementary failure mode silently breaks IKEv2 MOBIKE address-update handling in non-init network namespaces because the issuing namespace never receives its own migration notification, degrading VPN availability without kernel crash."
    }
  }
}