{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63914", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.020Z", "datePublished": "2026-07-19T14:55:18.618Z", "dateUpdated": "2026-08-05T12:37:08.336Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:08.336Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L", "baseScore": 7.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "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—traffic selectors, old/new tunnel endpoint addresses, and km_address negotiation endpoints—from 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/xfrm.h", "net/key/af_key.c", "net/xfrm/xfrm_policy.c", "net/xfrm/xfrm_state.c", "net/xfrm/xfrm_user.c" ], "versions": [ { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "6df8157547347b5257bf640a0ae3dfc4411e06cd", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "fe463798343382c8fe9416a95959f005a3c30aa5", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "00f2c451e57df50b1151d9b2254878f106b7c892", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "a306cf2ac8849c487791369fad6f216399d000f6", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "448bb92ca101dde8a6e88b4dc824044b4e341604", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126", "status": "affected", "versionType": "git" }, { "version": "5c79de6e79cd8ecfbae28886be3ee49044f3a4d4", "lessThan": "7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/xfrm.h", "net/key/af_key.c", "net/xfrm/xfrm_policy.c", "net/xfrm/xfrm_state.c", "net/xfrm/xfrm_user.c" ], "versions": [ { "version": "2.6.21", "status": "affected" }, { "version": "0", "lessThan": "2.6.21", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "7.1" } ] } ] } ], "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" } ], "title": "xfrm: route MIGRATE notifications to caller's netns", "x_generator": { "engine": "bippy-1.2.0" } } } }