crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks

{
  "id": "c8e9e4c3f483afe4d76f9effbc541e87abc5d9b13bea6101ceabea83be127127",
  "url": "https://osv.dev/vulnerability/CVE-2026-64208",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks Change the krb5 crypto library to provide facilities to precheck the length of the message about to be decrypted or verified. Fix AF_RXRPC to make use of this to validate DATA packets secured with RxGK.",
    "evidence": "osv:CVE-2026-64208",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-64208",
      "aliases": [
        "CVE-2026-64208"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.16.0"
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              "type": "ECOSYSTEM",
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                {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64208.json"
          }
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      ],
      "modified": "2026-10-28T02:30:32.161728311Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2b50aceafe6606ea52ed42aadd1b4d44a188aade",
        "https://git.kernel.org/stable/c/585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff",
        "https://git.kernel.org/stable/c/9217017f4bce53dddb8d547837f1f707045d64ad",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64208.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64208",
        "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/2026/64xxx/CVE-2026-64208.json"
      }
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    "related_cves": [
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        "value": "CVE-2026-64208",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498851,
  "published_at": "2026-07-24T15:23:00.113+00:00"
}