rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

{
  "id": "b9d911ffc19cbe9b7815fe7ac80114b396a400bb0166d38cdc27d1406f9abd83",
  "url": "https://osv.dev/vulnerability/CVE-2026-43500",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.",
    "evidence": "osv:CVE-2026-43500",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.140",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.88",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.29",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-43500",
      "aliases": [
        "CVE-2026-43500"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
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                  "fixed": "3711382a77342a9a1c3d2e7330dcfc7ea927f568"
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                {
                  "fixed": "3eae0f4f9f7206a4801efa5e0235c25bbd5a412c"
                },
                {
                  "fixed": "d45179f8795222ce858770dc619abe51f9d24411"
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                {
                  "fixed": "aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43500.json"
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          "ranges": [
            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.3.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43500.json"
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      ],
      "modified": "2026-10-28T02:30:43.793961321Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568",
        "https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c",
        "https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b",
        "https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71",
        "https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43500.json",
        "https://access.redhat.com/security/cve/CVE-2026-43500",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43500.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43500",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2468273",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
        "https://github.com/V4bel/dirtyfrag"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43500.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43500",
        "evidence": "/id"
      }
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511704,
  "published_at": "2026-05-11T06:26:45.838+00:00"
}