{
  "cveId": "CVE-2026-80666",
  "url": "https://patchblox.com/security/cve/CVE-2026-80666",
  "summary": "CVE-2026-80666 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80666 (version 7.1.5-1), released August 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: sco: Fix a race condition in sco_sock...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: sco: Fix a race condition in sco_sock_timeout()  sco_sock_timeout() runs asynchronously and lock_sock(sk). If the socket is closing while the timer is running, it holds the same lock (lock_sock(sk)) twice, leading to a deadlock.  CPU 0                      CPU 1 ====================       ====================== sco_sock_close()                            sco_sock_timeout() lock_sock(sk) // \u003C-- LOCK   __sco_sock_close()     sco_chan_del()       sco_conn_put() \t      sco_conn_free() \t        disable_delayed_work_sync() \t                           lock(sk) // \u003C-- SAME LOCK  Fix this by moving disable_delayed_work_sync() outside of lock_sock(sk), ensuring that no lock_sock(sk) is held before sco_sock_timeout().  Lockdep splat:  WARNING: possible circular locking dependency detected 6.13.0-rc4 #7 Not tainted  syz-executor292/9514 is trying to acquire lock: ffff8881115d5070 ((work_completion)(\u0026(\u0026conn-\u003Etimeout_work)-\u003Ework)){\u002B.\u002B.}-{0:0}, at: rcu_lock_acquire sect/v6.13-rc4/./include/linux/rcupdate.h:337 [inline] ffff8881115d5070 ((work_completion)(\u0026(\u0026conn-\u003Etimeout_work)-\u003Ework)){\u002B.\u002B.}-{0:0}, at: rcu_read_lock sect/v6.13-rc4/./include/linux/rcupdate.h:849 [inline] ffff8881115d5070 ((work_completion)(\u0026(\u0026conn-\u003Etimeout_work)-\u003Ework)){\u002B.\u002B.}-{0:0}, at: start_flush_work sect/v6.13-rc4/kernel/workqueue.c:4137 [inline] ffff8881115d5070 ((work_completion)(\u0026(\u0026conn-\u003Etimeout_work)-\u003Ework)){\u002B.\u002B.}-{0:0}, at: __flush_work\u002B0xd1/0xc40 sect/v6.13-rc4/kernel/workqueue.c:4195  but task is already holding lock: ffff88807db3a258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){\u002B.\u002B.}-{0:0}, at: lock_sock sect/v6.13-rc4/./include/net/sock.h:1623 [inline] ffff88807db3a258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){\u002B.\u002B.}-{0:0}, at: sco_sock_close\u002B0x25/0x100 sect/v6.13-rc4/net/bluetooth/sco.c:524  which lock already depends on the new lock.  the existing dependency chain (in reverse order) is:  -\u003E #1 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){\u002B.\u002B.}-{0:0}:        lock_acquire\u002B0x1c4/0x520 sect/v6.13-rc4/kernel/locking/lockdep.c:5849        lock_sock_nested\u002B0x48/0x130 sect/v6.13-rc4/net/core/sock.c:3622        lock_sock sect/v6.13-rc4/./include/net/sock.h:1623 [inline]        sco_sock_timeout\u002B0xbe/0x270 sect/v6.13-rc4/net/bluetooth/sco.c:158        process_one_work sect/v6.13-rc4/kernel/workqueue.c:3229 [inline]        process_scheduled_works\u002B0xa99/0x18f0 sect/v6.13-rc4/kernel/workqueue.c:3310        worker_thread\u002B0x8a9/0xd80 sect/v6.13-rc4/kernel/workqueue.c:3391        kthread\u002B0x2c6/0x360 sect/v6.13-rc4/kernel/kthread.c:389        ret_from_fork\u002B0x4e/0x80 sect/v6.13-rc4/arch/x86/kernel/process.c:147        ret_from_fork_asm\u002B0x1a/0x30 sect/v6.13-rc4/arch/x86/entry/entry_64.S:244  -\u003E #0 ((work_completion)(\u0026(\u0026conn-\u003Etimeout_work)-\u003Ework)){\u002B.\u002B.}-{0:0}:        check_prev_add sect/v6.13-rc4/kernel/locking/lockdep.c:3161 [inline]        check_prevs_add sect/v6.13-rc4/kernel/locking/lockdep.c:3280 [inline]        validate_chain\u002B0x1888/0x5760 sect/v6.13-rc4/kernel/locking/lockdep.c:3904        __lock_acquire\u002B0x13b4/0x2120 sect/v6.13-rc4/kernel/locking/lockdep.c:5226        lock_acquire\u002B0x1c4/0x520 sect/v6.13-rc4/kernel/locking/lockdep.c:5849        touch_work_lockdep_map sect/v6.13-rc4/kernel/workqueue.c:3909 [inline]        start_flush_work sect/v6.13-rc4/kernel/workqueue.c:4163 [inline]        __flush_work\u002B0x70f/0xc40 sect/v6.13-rc4/kernel/workqueue.c:4195        __cancel_work_sync sect/v6.13-rc4/kernel/workqueue.c:4351 [inline]        disable_delayed_work_sync\u002B0xbb/0xf0 sect/v6.13-rc4/kernel/workqueue.c:4514        sco_conn_free sect/v6.13-rc4/net/bluetooth/sco.c:95 [inline]        kref_put sect/v6.13-rc4/./include/linux/kref.h:65 [inline]        sco_conn_put\u002B0x18f/0x270 sect/v6.13-rc4/net/bluetooth/sco.c:107        sco_chan_del\u002B0xe2/0x210 sect/v6.13-rc4/net/bluetooth/sco.c:236        sco_sock_close\u002B0x8f/0x100 sect/v6.13-rc4/net/bluetooth/sco.c:526        sco_sock_release\u002B0x62/0x2d0 sect/v6.13-rc4/net/blueto ---truncated---",
  "published": "2026-08-28T08:16:51Z",
  "severity": "",
  "epss": 0.00206,
  "epssPercentile": 0.10776,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.5-1",
      "fix": "DEBIAN-CVE-2026-80666",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80666",
      "released": "2026-08-29T00:46:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}