{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.180-1"
            }
          ],
          "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": "7.1.5-1"
            }
          ],
          "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: eir: Fix stack OOB write when prepending the Flags AD  eir_create_adv_data() builds the advertising data into a fixed-size buffer (\"size\", 31 for the legacy path). It may prepend a 3-byte \"Flags\" AD structure (LE_AD_NO_BREDR on an LE-only controller) and then copies the per-instance data without checking that it still fits:  \tmemcpy(ptr, adv-\u003eadv_data, adv-\u003eadv_data_len);  tlv_data_max_len() only reserves those 3 bytes when the user-supplied flags carry a managed-flags bit, so an instance added with flags == 0 is accepted with adv_data_len up to the full buffer. At advertise time the flags are still prepended, and the memcpy() writes 3 + adv_data_len bytes into the size-byte buffer:    BUG: KASAN: stack-out-of-bounds in eir_create_adv_data (net/bluetooth/eir.c:301)   Write of size 31 at addr ffff88800a547bdc by task kworker/u9:0/65   Workqueue: hci0 hci_cmd_sync_work    __asan_memcpy (mm/kasan/shadow.c:106)    eir_create_adv_data (net/bluetooth/eir.c:301)    hci_update_adv_data_sync (net/bluetooth/hci_sync.c:1310)    hci_schedule_adv_instance_sync (net/bluetooth/hci_sync.c:1817)    hci_cmd_sync_work (net/bluetooth/hci_sync.c:332)   This frame has 1 object:    [32, 64) 'cp'  The \"Flags\" structure is added by the kernel, not requested by userspace, so only prepend it when it fits together with the instance advertising data; when there is no room for both, drop the flags rather than the user-provided data.  Reachable by a local user with CAP_NET_ADMIN owning an LE-only controller on the legacy advertising path.",
  "id": "DEBIAN-CVE-2026-64539",
  "modified": "2026-09-14T16:47:33.621125752Z",
  "published": "2026-07-27T21:17:06.277Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64539"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64539"
  ]
}