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xfrm: fix compat ALLOCSPI request use-after-free

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: xfrm: fix compat ALLOCSPI request use-after-free xfrm_state_netlink() builds the ALLOCSPI response with dump_one_state(), which already calls alloc_compat() with the response skb and header. xfrm_alloc_userspi() then calls alloc_compat() again, but passes the original request skb and its header. For a compat request, the translator therefore interprets the 228-byte compat xfrm_userspi_info as the 232-byte native layout and reads four bytes past the declared payload. It also publishes the translated child through the request's frag_list. A multicast clone of the request shares skb_shared_info and can observe that child. xfrm_user_rcv_msg() frees it after the request handler returns, racing a compat receiver which may still be copying from it and resulting in a use-after-free. Remove the redundant conversion. The response keeps its correct compat translation from dump_one_state(), and no child is attached to the inbound request.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.271, 5.15.222, 6.1.189, 6.12.112, 6.18.54, 6.6.158, 7.2.8
CVEs
CVE-2026-98370
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 10:27 UTC · Revision 1

Source evidence

xfrm: fix compat ALLOCSPI request use-after-free

core-osv · Original source

Published 6 Oct 2026, 08:46 UTC

In the Linux kernel, the following vulnerability has been resolved: xfrm: fix compat ALLOCSPI request use-after-free xfrm_state_netlink() builds the ALLOCSPI response with dump_one_state(), which already calls alloc_compat() with the response skb and header. xfrm_alloc_userspi() then calls alloc_compat() again, but passes the original request skb and its header. For a compat request, the translator therefore interprets the 228-byte compat xfrm_userspi_info as the 232-byte native layout and reads four bytes past the declared payload. It also publishes the translated child through the request's frag_list. A multicast clone of the request shares skb_shared_info and can observe that child. xfrm_user_rcv_msg() frees it after the request handler returns, racing a compat receiver which may still be copying from it and resulting in a use-after-free. Remove the redundant conversion. The response keeps its correct compat translation from dump_one_state(), and no child is attached to the inbound request.

osv:CVE-2026-98370

Kernel

Fixed versions: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8

Complete source record
{
  "id": "00eee5202a50d3301112f1a777513f41b7806225033da28226ec66a4072748c9",
  "url": "https://osv.dev/vulnerability/CVE-2026-98370",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfrm: fix compat ALLOCSPI request use-after-free",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfrm: fix compat ALLOCSPI request use-after-free xfrm_state_netlink() builds the ALLOCSPI response with dump_one_state(), which already calls alloc_compat() with the response skb and header. xfrm_alloc_userspi() then calls alloc_compat() again, but passes the original request skb and its header. For a compat request, the translator therefore interprets the 228-byte compat xfrm_userspi_info as the 232-byte native layout and reads four bytes past the declared payload. It also publishes the translated child through the request's frag_list. A multicast clone of the request shares skb_shared_info and can observe that child. xfrm_user_rcv_msg() frees it after the request handler returns, racing a compat receiver which may still be copying from it and resulting in a use-after-free. Remove the redundant conversion. The response keeps its correct compat translation from dump_one_state(), and no child is attached to the inbound request.",
    "evidence": "osv:CVE-2026-98370",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.271",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98370",
      "aliases": [
        "CVE-2026-98370"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
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                },
                {
                  "fixed": "42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810"
                },
                {
                  "fixed": "2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718"
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                {
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                {
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.10.0"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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                  "fixed": "5.15.222"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
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                {
                  "fixed": "6.1.189"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
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            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.7.0"
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              ]
            },
            {
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              "events": [
                {
                  "introduced": "6.13.0"
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                {
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            {
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                  "introduced": "6.19.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98370.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.936748136Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25",
        "https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33",
        "https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718",
        "https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810",
        "https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4",
        "https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5",
        "https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320",
        "https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98370.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98370",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98370.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98370",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494533,
  "published_at": "2026-10-06T08:46:54.981+00:00"
}