{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.113-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.11-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: ISO: Reject concurrent BIS listener setup  iso_sock_listen() drops the socket lock before calling iso_listen_bis() to preserve the hdev-\u003elock ordering. Two concurrent listen() calls on the same broadcast socket can therefore both observe BT_BOUND. Caller A can attach connA and release the locks, then caller B can acquire them and attach connB before A publishes BT_LISTEN.  __iso_chan_add() checks whether connB already has a socket, but not whether the socket already has a connection. The second attachment overwrites iso_pi(sk)-\u003econn, leaking the connA reference and leaving connA-\u003esk intact. Socket teardown follows connB, so later events on connA can cause a stale socket access.  Recheck BT_BOUND and require iso_pi(sk)-\u003econn to be NULL after taking both the HCI device and socket locks in iso_listen_bis(). The connection check also covers the interval between attachment and publication of BT_LISTEN. Reject a competing setup with -EBADFD through the existing unlock path before allocating another connection.  A recorded KASAN report from an instrumented kernel shows:    BUG: KASAN: slab-use-after-free in iso_sock_hold+0x119/0x1f0   Call Trace:    iso_sock_hold+0x119/0x1f0    iso_conn_del+0xe4/0x270    hci_disconn_complete_evt+0x351/0x8c0    hci_event_packet+0x71b/0xb20    hci_rx_work+0x293/0x730    Allocated by task 93:    sk_prot_alloc+0x113/0x220    sk_alloc+0x2b/0x6d0    bt_sock_alloc+0x29/0x370    iso_sock_alloc.constprop.0+0x19/0x300    iso_sock_create+0x94/0x100    Freed by task 93:    kfree+0x121/0x3c0    __sk_destruct+0x42b/0x540    iso_sock_release+0x29d/0x340    __sock_release+0xa1/0x260    sock_close+0x10/0x20",
  "id": "DEBIAN-CVE-2026-99013",
  "modified": "2026-10-25T09:47:33.462577203Z",
  "published": "2026-10-23T13:17:24.013Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-99013"
    }
  ],
  "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-2026-99013"
  ]
}