Bluetooth: ISO: fix leaking sk after socket release

{
  "id": "eeb876a352fa9ed551509f81196f3b0f72f68ed3b4d7a321f438c753f3492cab",
  "url": "https://osv.dev/vulnerability/CVE-2026-74536",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: ISO: fix leaking sk after socket release",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix leaking sk after socket release iso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || sock_flag(sk, SOCK_DEAD) for early return, but this is always true since sock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket always leaks, iso_sock_destruct is never called. The socket reference also leaks when __iso_sock_close() does not set SOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after zapping. Fix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for something else, and lock_sock to ensure iso_sock_kill() puts sk only after socket release only once. Release and iso_conn_del may run concurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up after zapping. Remove call to iso_sock_kill() from iso_sock_close(), as it's generally no-op there.",
    "evidence": "osv:CVE-2026-74536",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.103",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.44",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74536",
      "aliases": [
        "CVE-2026-74536"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "e30e5ca63c8fbe3cd505fbb419bb547760cda633"
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                {
                  "fixed": "ce57442a379212fe3fda59c9437ee8217eceb5b1"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74536.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.0.0"
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                {
                  "fixed": "6.12.103"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.44"
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            {
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                  "introduced": "6.19.0"
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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-2026-74536.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.392039240Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023",
        "https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1",
        "https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633",
        "https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74536.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74536",
        "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/2026/74xxx/CVE-2026-74536.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74536",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519687,
  "published_at": "2026-08-15T12:27:49.054+00:00"
}