{"id":"CVE-2026-63914","title":"xfrm: route MIGRATE notifications to caller's netns","summary":"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 fo…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 6df8157547347b5257bf640a0ae3dfc4411e06cd","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < fe463798343382c8fe9416a95959f005a3c30aa5","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 00f2c451e57df50b1151d9b2254878f106b7c892","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < a306cf2ac8849c487791369fad6f216399d000f6","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 448bb92ca101dde8a6e88b4dc824044b4e341604","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126","Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4","Linux 2.6.21"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:33:13.785456Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:11.103Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63914","references":[{"url":"https://git.kernel.org/stable/c/bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad"},{"url":"https://git.kernel.org/stable/c/6df8157547347b5257bf640a0ae3dfc4411e06cd"},{"url":"https://git.kernel.org/stable/c/fe463798343382c8fe9416a95959f005a3c30aa5"},{"url":"https://git.kernel.org/stable/c/00f2c451e57df50b1151d9b2254878f106b7c892"},{"url":"https://git.kernel.org/stable/c/a306cf2ac8849c487791369fad6f216399d000f6"},{"url":"https://git.kernel.org/stable/c/448bb92ca101dde8a6e88b4dc824044b4e341604"},{"url":"https://git.kernel.org/stable/c/26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126"},{"url":"https://git.kernel.org/stable/c/7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4"}],"tags":["cve.org"],"epss":0.0016,"epssPercentile":0.04701,"ingestedAt":"2026-10-16T17:24:46.776Z","slug":"CVE-2026-63914","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 6df8157547347b5257bf640a0ae3dfc4411e06cd`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < fe463798343382c8fe9416a95959f005a3c30aa5`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 00f2c451e57df50b1151d9b2254878f106b7c892`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < a306cf2ac8849c487791369fad6f216399d000f6`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 448bb92ca101dde8a6e88b4dc824044b4e341604`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126`\n- `Linux >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4`\n- `Linux 2.6.21`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}