{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.4-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref  l2cap_chan_timeout() runs asynchronously and accesses chan-\u003econn. If the connection is torn down while the timer is running or pending, chan-\u003econn can be freed, leading to a use-after-free when the timer worker attempts to lock conn-\u003elock:  | BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] | BUG: KASAN: slab-use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline] | BUG: KASAN: slab-use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:161 [inline] | BUG: KASAN: slab-use-after-free in mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318 | Write of size 8 at addr ffff8881298d9550 by task kworker/2:1/83 | | CPU: 2 UID: 0 PID: 83 Comm: kworker/2:1 Not tainted 7.1.0-rc6-next-20260601-dirty #6 PREEMPT(full) | Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 | Workqueue: events l2cap_chan_timeout | Call Trace: |  \u003cTASK\u003e |  instrument_atomic_read_write include/linux/instrumented.h:112 [inline] |  atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline] |  __mutex_trylock_fast kernel/locking/mutex.c:161 [inline] |  mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318 |  l2cap_chan_timeout+0x5d/0x1b0 net/bluetooth/l2cap_core.c:422 |  process_one_work kernel/workqueue.c:3326 [inline] |  process_scheduled_works+0x7c8/0xfb0 kernel/workqueue.c:3409 |  worker_thread+0x8a9/0xcf0 kernel/workqueue.c:3490 |  kthread+0x346/0x430 kernel/kthread.c:436 |  ret_from_fork+0x1a3/0x470 arch/x86/kernel/process.c:158 |  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 |  \u003c/TASK\u003e | | Allocated by task 320: |  l2cap_conn_add+0xa7/0x820 net/bluetooth/l2cap_core.c:7075 |  l2cap_connect_cfm+0xdb/0xd70 net/bluetooth/l2cap_core.c:7452 |  hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline] |  hci_remote_features_evt+0x52f/0x9f0 net/bluetooth/hci_event.c:3760 |  hci_event_func net/bluetooth/hci_event.c:7796 [inline] |  hci_event_packet+0x561/0xa70 net/bluetooth/hci_event.c:7847 |  hci_rx_work+0x370/0x890 net/bluetooth/hci_core.c:4040 |  process_one_work kernel/workqueue.c:3326 [inline] |  process_scheduled_works+0x7c8/0xfb0 kernel/workqueue.c:3409 |  worker_thread+0x8a9/0xcf0 kernel/workqueue.c:3490 |  kthread+0x346/0x430 kernel/kthread.c:436 |  ret_from_fork+0x1a3/0x470 arch/x86/kernel/process.c:158 |  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 | | Freed by task 322: |  hci_disconn_cfm include/net/bluetooth/hci_core.h:2154 [inline] |  hci_conn_hash_flush+0x101/0x1f0 net/bluetooth/hci_conn.c:2736 |  hci_dev_close_sync+0x889/0xde0 net/bluetooth/hci_sync.c:5405 |  hci_dev_do_close net/bluetooth/hci_core.c:502 [inline] |  hci_unregister_dev+0x1f7/0x370 net/bluetooth/hci_core.c:2679 |  vhci_release+0x12a/0x180 drivers/bluetooth/hci_vhci.c:690 |  __fput+0x369/0x890 fs/file_table.c:510 |  task_work_run+0x160/0x1d0 kernel/task_work.c:233 |  get_signal+0xf5b/0x1120 kernel/signal.c:2810 |  arch_do_signal_or_restart+0x4d/0x600 arch/x86/kernel/signal.c:337 |  __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] |  exit_to_user_mode_loop+0x85/0x510 kernel/entry/common.c:98 |  do_syscall_64+0x263/0x3d0 arch/x86/entry/syscall_64.c:100 |  entry_SYSCALL_64_after_hwframe+0x77/0x7f | | The buggy address belongs to the object at ffff8881298d9400 |  which belongs to the cache kmalloc-512 of size 512 | The buggy address is located 336 bytes inside of |  freed 512-byte region [ffff8881298d9400, ffff8881298d9600)  Fix it by having chan-\u003econn hold a reference to l2cap_conn (via l2cap_conn_get) when the channel is added to the connection, and releasing it in the channel destructor. This ensures the l2cap_conn remains alive as long as the channel exists.  A new FLAG_DEL channel flag is introduced to indicate that the ch ---truncated---",
  "id": "DEBIAN-CVE-2026-64434",
  "modified": "2026-09-14T16:47:41.952725917Z",
  "published": "2026-07-25T10:17:27.717Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64434"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64434"
  ]
}