rxrpc: reject undecryptable rxkad response tickets

{
  "id": "2851b782d0e5b452a710c8f44085c0ea53b805f4951ebfbff4324ac8c6590d2b",
  "url": "https://osv.dev/vulnerability/CVE-2026-31637",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rxrpc: reject undecryptable rxkad response tickets",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded. A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes. Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.",
    "evidence": "osv:CVE-2026-31637",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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    "severity": "critical",
    "structured": {
      "id": "CVE-2026-31637",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
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      ],
      "modified": "2026-10-28T02:30:30.798046789Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60",
        "https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a",
        "https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a",
        "https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d",
        "https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de",
        "https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c",
        "https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352",
        "https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31637.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31637",
        "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/2026/31xxx/CVE-2026-31637.json"
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        "value": "CVE-2026-31637",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497819,
  "published_at": "2026-04-24T14:44:51.364+00:00"
}