{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3"
            },
            {
              "fixed": "a5414b0a9464b863733c8bd97493cb443a210ec4"
            },
            {
              "fixed": "15754e4ec47ac5d117c9609c34a49ed6980ac4a1"
            },
            {
              "fixed": "4e93c65f87825e1e012bce56615320aeb123815d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.19.0"
            },
            {
              "fixed": "6.18.54"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98294.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_qca: Do not write to the serial port after it is closed\n\nhci_uart_close() closes the serdev port if HCI_QUIRK_NON_PERSISTENT_SETUP\nis set (for example, for the WCN399x family). A failed hci_dev_open_sync()\nfollowing a successful qca_setup() calls hdev-\u003eclose() but not\nhdev-\u003eshutdown(), so the port is closed while power-\u003evregs_on is left true.\nqca_serdev_remove() then passes its power-\u003evregs_on test and calls\nqca_power_off(), which writes to the closed port unconditionally.\n\nSeen on a WCN3988 by unbinding the driver after a controller failure. The\ntrace below is from a 7.0.0 based kernel, where qca_power_off() was still\nnamed qca_power_shutdown():\n\n  Unable to handle kernel NULL pointer dereference at virtual address\n  0000000000000038\n  Call trace:\n   tty_set_termios+0x50/0x238 (P)\n   ttyport_set_baudrate+0x84/0xc0\n   serdev_device_set_baudrate+0x24/0x40\n   qca_power_shutdown+0x158/0x1fc [hci_uart]\n   qca_serdev_remove+0x54/0x68 [hci_uart]\n   serdev_drv_remove+0x1c/0x2c\n   device_remove+0x4c/0x80\n   device_release_driver_internal+0x1cc/0x224\n   device_driver_detach+0x18/0x24\n   unbind_store+0xb4/0xc0\n\nCheck HCI_UART_PROTO_READY, which hci_uart_close() clears in the same place\nit closes the port, before writing to it. The regulator disable is left\nunconditional so the controller is still powered down.\n\nThe dangling serport-\u003etty that turns this into a use-after-free is\naddressed in a separate patch.",
  "id": "CVE-2026-98294",
  "modified": "2026-10-08T02:30:59.014365878Z",
  "published": "2026-10-06T08:45:53.338Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15754e4ec47ac5d117c9609c34a49ed6980ac4a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e93c65f87825e1e012bce56615320aeb123815d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5414b0a9464b863733c8bd97493cb443a210ec4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98294.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98294"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Bluetooth: hci_qca: Do not write to the serial port after it is closed"
}