SUNRPC: wait for in-flight client TLS handshake callback

{
  "id": "5cf0d72e98a3fff53271547cef5b6651236acd556175bb4effaf0c3ae9f552fe",
  "url": "https://osv.dev/vulnerability/CVE-2026-89536",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SUNRPC: wait for in-flight client TLS handshake callback",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: SUNRPC: wait for in-flight client TLS handshake callback xs_tls_handshake_sync() gives xs_tls_handshake_done() a reference to the lower transport before submitting the handshake request. On timeout or signal, the synchronous waiter drops that reference after calling tls_handshake_cancel(). handshake_req_cancel() returns false when handshake_complete() has already marked the request complete. In that case the completion callback can still be running, so dropping the callback-owned reference in the waiter can free the lower transport before xs_tls_handshake_done() stores xprt_err or drops its own reference. If cancellation loses to completion, wait until xs_tls_handshake_done() signals handshake_done and let the callback release its reference. This mirrors the server-side handshake lifetime handling and keeps the timeout or signal return value unchanged.",
    "evidence": "osv:CVE-2026-89536",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-89536",
      "aliases": [
        "CVE-2026-89536"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "75eb6af7acdf566c68d61e98e67ee2f235201c02"
                },
                {
                  "fixed": "fb43997407bc17ee39bac81ab708101312e255f5"
                },
                {
                  "fixed": "15431820f448e09f8029b670d5c82aa5917d4625"
                },
                {
                  "fixed": "1de391e8b94e31b45c19c16dbf315e294810c7de"
                },
                {
                  "fixed": "7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b"
                },
                {
                  "fixed": "a89dd597458848b463d284b15e42a8078beeb046"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89536.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
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                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                  "fixed": "6.12.109"
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.50"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.4"
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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-2026-89536.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.152116223Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15431820f448e09f8029b670d5c82aa5917d4625",
        "https://git.kernel.org/stable/c/1de391e8b94e31b45c19c16dbf315e294810c7de",
        "https://git.kernel.org/stable/c/7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b",
        "https://git.kernel.org/stable/c/a89dd597458848b463d284b15e42a8078beeb046",
        "https://git.kernel.org/stable/c/fb43997407bc17ee39bac81ab708101312e255f5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89536.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89536",
        "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/2026/89xxx/CVE-2026-89536.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89536",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507775,
  "published_at": "2026-09-11T19:44:14.473+00:00"
}