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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
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
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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{
  "containers": {
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          "programFiles": [
            "include/net/xfrm.h",
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            "net/xfrm/xfrm_state.c",
            "net/xfrm/xfrm_user.c"
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              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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      "descriptions": [
        {
          "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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            "baseScore": 7.3,
            "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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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:41:24.004Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "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"
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          "url": "https://git.kernel.org/stable/c/448bb92ca101dde8a6e88b4dc824044b4e341604"
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          "url": "https://git.kernel.org/stable/c/26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4"
        }
      ],
      "title": "xfrm: route MIGRATE notifications to caller\u0027s netns",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63914",
    "datePublished": "2026-07-19T14:55:18.618Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-07-20T13:41:24.004Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63914",
      "date": "2026-07-21",
      "epss": "0.00155",
      "percentile": "0.05138"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63914\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:09.373\",\"lastModified\":\"2026-07-20T15:16:55.553\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"6df8157547347b5257bf640a0ae3dfc4411e06cd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"fe463798343382c8fe9416a95959f005a3c30aa5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"00f2c451e57df50b1151d9b2254878f106b7c892\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"a306cf2ac8849c487791369fad6f216399d000f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"448bb92ca101dde8a6e88b4dc824044b4e341604\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c79de6e79cd8ecfbae28886be3ee49044f3a4d4\",\"lessThan\":\"7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.21\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.21\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.0,\"impactScore\":4.7}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.