CVE-2026-98370 (GCVE-0-2026-98370)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:18
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
Version: 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_user.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix compat ALLOCSPI request use-after-free\n\nxfrm_state_netlink() builds the ALLOCSPI response with\ndump_one_state(), which already calls alloc_compat() with the response\nskb and header.\n\nxfrm_alloc_userspi() then calls alloc_compat() again, but passes the\noriginal request skb and its header. For a compat request, the\ntranslator therefore interprets the 228-byte compat xfrm_userspi_info\nas the 232-byte native layout and reads four bytes past the declared\npayload. It also publishes the translated child through the request\u0027s\nfrag_list.\n\nA multicast clone of the request shares skb_shared_info and can observe\nthat child. xfrm_user_rcv_msg() frees it after the request handler\nreturns, racing a compat receiver which may still be copying from it and\nresulting in a use-after-free.\n\nRemove the redundant conversion. The response keeps its correct compat\ntranslation from dump_one_state(), and no child is attached to the\ninbound request."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:22.245Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25"
        },
        {
          "url": "https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33"
        },
        {
          "url": "https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320"
        }
      ],
      "title": "xfrm: fix compat ALLOCSPI request use-after-free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98370",
    "datePublished": "2026-10-06T08:46:54.981Z",
    "dateReserved": "2026-09-25T10:25:14.344Z",
    "dateUpdated": "2026-10-19T09:18:22.245Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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