CVE-2026-63914 (GCVE-0-2026-63914)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
Title
xfrm: route MIGRATE notifications to caller's netns
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: route MIGRATE notifications to caller's netns xfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate() in net/key/af_key.c both hardcode &init_net for the multicast that announces a successful XFRM_MSG_MIGRATE / SADB_X_MIGRATE. XFRM_MSG_MIGRATE arrives on a per-netns NETLINK_XFRM socket, and the rest of the xfrm/af_key netlink path was made netns-aware in 2008. The other 14 multicast paths in xfrm_user.c route their event using xs_net(x), xp_net(xp) or sock_net(skb->sk); only the migrate path was missed. Two consequences of the init_net hardcoding: 1. The notification (selector, old/new endpoint addresses, and the km_address) is delivered to listeners on init_net's XFRMNLGRP_MIGRATE / pfkey BROADCAST_ALL groups rather than on the issuing netns. An IKE daemon running in init_net therefore receives migration notifications originating from any other netns on the host. 2. An IKE daemon running inside a non-init netns and subscribed to its own XFRMNLGRP_MIGRATE / pfkey groups never receives the notification of its own migration. IKEv2 MOBIKE / address-update handling inside a netns is silently broken. Thread struct net through km_migrate() and the xfrm_mgr.migrate function pointer, drop the &init_net override in xfrm_send_migrate() and pfkey_send_migrate(), and pass the caller's net (already in scope in xfrm_migrate() via sock_net(skb->sk)) all the way down. struct xfrm_mgr is in-tree only and not exported as a stable API, so the function-pointer signature change is internal. pfkey_broadcast() is already netns-aware via net_generic(net, pfkey_net_id) since the pernet conversion. The five other pfkey_broadcast() callers in af_key.c already pass xs_net(x), sock_net(sk) or a per-netns net, so this only removes the &init_net outlier.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < 6df8157547347b5257bf640a0ae3dfc4411e06cd (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < fe463798343382c8fe9416a95959f005a3c30aa5 (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < 00f2c451e57df50b1151d9b2254878f106b7c892 (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < a306cf2ac8849c487791369fad6f216399d000f6 (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < 448bb92ca101dde8a6e88b4dc824044b4e341604 (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126 (git)
Affected: 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 , < 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4 (git)
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Linux Linux Affected: 2.6.21
Unaffected: 0 , < 2.6.21 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: route MIGRATE notifications to caller\u0027s netns\n\nxfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate()\nin net/key/af_key.c both hardcode \u0026init_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-\u003esk); 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\u0027s\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 \u0026init_net override in xfrm_send_migrate()\nand pfkey_send_migrate(), and pass the caller\u0027s net (already in\nscope in xfrm_migrate() via sock_net(skb-\u003esk)) 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\u0026init_net outlier."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L",
            "version": "3.1"
          },
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            {
              "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\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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:37:08.336Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
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        {
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        {
          "url": "https://git.kernel.org/stable/c/7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4"
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      ],
      "title": "xfrm: route MIGRATE notifications to caller\u0027s netns",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63914",
    "datePublished": "2026-07-19T14:55:18.618Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-08-05T12:37:08.336Z",
    "state": "PUBLISHED"
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      "date": "2026-10-01",
      "epss": "0.00162",
      "percentile": "0.04792"
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          }
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: route MIGRATE notifications to caller\u0027s netns\n\nxfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate()\nin net/key/af_key.c both hardcode \u0026init_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-\u003esk); 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\u0027s\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 \u0026init_net override in xfrm_send_migrate()\nand pfkey_send_migrate(), and pass the caller\u0027s net (already in\nscope in xfrm_migrate() via sock_net(skb-\u003esk)) 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\u0026init_net outlier."
          }
        ],
        "id": "CVE-2026-63914",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "LOW",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 2.0,
              "impactScore": 4.7,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-07-19T16:17:09.373",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/00f2c451e57df50b1151d9b2254878f106b7c892"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/448bb92ca101dde8a6e88b4dc824044b4e341604"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6df8157547347b5257bf640a0ae3dfc4411e06cd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a306cf2ac8849c487791369fad6f216399d000f6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fe463798343382c8fe9416a95959f005a3c30aa5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:20:58+00:00",
      "cve": "CVE-2026-63914",
      "id": "CVE-2026-63914",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: route MIGRATE notifications to caller\u0027s netns",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63914.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:58:16Z",
      "cve": "CVE-2026-63914",
      "id": "CVE-2026-63914",
      "initial_release_date": "2026-07-21T13:03:40Z",
      "product_status:known_affected": "372",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63914",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63914.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.