{
  "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": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: hci_sync: Fix advertising data UAFs  hci_find_adv_instance() returns an adv_info pointer that is valid only while hdev-\u003elock is held.  The advertising command-sync paths perform instance lookups without that lock and, in some cases, retain the pointer while waiting for a controller response.  An advertising termination event can therefore interleave as follows:    hci_cmd_sync_work                 hci_rx_work   hci_find_adv_instance()   __hci_cmd_sync_status()     wait for controller reply       hci_dev_lock()                                     hci_remove_adv_instance()                                       kfree(adv)   adv-\u003escan_rsp_changed = false  KASAN reported:    BUG: KASAN: slab-use-after-free in hci_set_ext_scan_rsp_data_sync+0x2e1/0x300   Write of size 1 at addr ffff88810a45d21d by task kworker/u17:0/88   Workqueue: hci0 hci_cmd_sync_work   Call Trace:    hci_set_ext_scan_rsp_data_sync+0x2e1/0x300    hci_schedule_adv_instance_sync+0x390/0x4c0    hci_cmd_sync_work+0x173/0x300   Allocated by task 87:    hci_add_adv_instance+0x538/0xac0    add_advertising+0x885/0x1160   Freed by task 89:    kfree+0x131/0x3c0    hci_remove_adv_instance+0x1d8/0x3b0    hci_le_ext_adv_term_evt+0x17b/0x730  Protect the instance lookup and payload construction in the extended advertising, scan response, and periodic advertising data paths.  Snapshot the advertising parameters under hdev-\u003elock, but release the lock before waiting for the controller.  Clear advertising-data dirty bits before issuing their commands and restore them after a failure using a fresh lookup.  Likewise, update the reported transmit power through a fresh lookup after the parameter command completes.  No adv_info pointer then survives an HCI command wait.",
  "id": "DEBIAN-CVE-2026-74509",
  "modified": "2026-09-19T21:47:29.701345908Z",
  "published": "2026-08-15T13:17:55.950Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74509"
    }
  ],
  "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-2026-74509"
  ]
}