Bluetooth: iso: Fix circular lock in iso_conn_big_sync

{
  "id": "e8a725ba95f089b42fc9be9b4e3297092a94f6eeb29c6cffcd0b6631475bcfb2",
  "url": "https://osv.dev/vulnerability/CVE-2024-54191",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: iso: Fix circular lock in iso_conn_big_sync",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: iso: Fix circular lock in iso_conn_big_sync This fixes the circular locking dependency warning below, by reworking iso_sock_recvmsg, to ensure that the socket lock is always released before calling a function that locks hdev. [ 561.670344] ====================================================== [ 561.670346] WARNING: possible circular locking dependency detected [ 561.670349] 6.12.0-rc6+ #26 Not tainted [ 561.670351] ------------------------------------------------------ [ 561.670353] iso-tester/3289 is trying to acquire lock: [ 561.670355] ffff88811f600078 (&hdev->lock){+.+.}-{3:3}, at: iso_conn_big_sync+0x73/0x260 [bluetooth] [ 561.670405] but task is already holding lock: [ 561.670407] ffff88815af58258 (sk_lock-AF_BLUETOOTH){+.+.}-{0:0}, at: iso_sock_recvmsg+0xbf/0x500 [bluetooth] [ 561.670450] which lock already depends on the new lock. [ 561.670452] the existing dependency chain (in reverse order) is: [ 561.670453] -> #2 (sk_lock-AF_BLUETOOTH){+.+.}-{0:0}: [ 561.670458] lock_acquire+0x7c/0xc0 [ 561.670463] lock_sock_nested+0x3b/0xf0 [ 561.670467] bt_accept_dequeue+0x1a5/0x4d0 [bluetooth] [ 561.670510] iso_sock_accept+0x271/0x830 [bluetooth] [ 561.670547] do_accept+0x3dd/0x610 [ 561.670550] __sys_accept4+0xd8/0x170 [ 561.670553] __x64_sys_accept+0x74/0xc0 [ 561.670556] x64_sys_call+0x17d6/0x25f0 [ 561.670559] do_syscall_64+0x87/0x150 [ 561.670563] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 561.6",
    "evidence": "osv:CVE-2024-54191",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.6",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-54191",
      "aliases": [
        "CVE-2024-54191"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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            "v6.12.4",
            "v6.12.3",
            "v6.12.2",
            "v6.11.11"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-54191.json"
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.2"
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                {
                  "fixed": "6.12.6"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-54191.json"
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      ],
      "modified": "2026-10-28T02:30:41.773910199Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7a17308c17880d259105f6e591eb1bc77b9612f0",
        "https://git.kernel.org/stable/c/cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/54xxx/CVE-2024-54191.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-54191",
        "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/2024/54xxx/CVE-2024-54191.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2024-54191",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 509305,
  "published_at": "2025-01-11T12:29:52.753+00:00"
}