{"id":"CVE-2026-98294","revision":"d9dd554f749a43e5898274bcb628ca66","records":[{"revision":"d9dd554f749a43e5898274bcb628ca66","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98294","aliases":[],"title":"Bluetooth: hci_qca: Do not write to the serial port after it is closed","description":"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->close() but not\nhdev->shutdown(), so the port is closed while power->vregs_on is left true.\nqca_serdev_remove() then passes its power->vregs_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->tty that turns this into a use-after-free is\naddressed in a separate patch.","state":0,"publishedAt":"2026-10-06T08:45:53.338+00:00","modifiedAt":"2026-10-19T09:17:05.335+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/bluetooth/hci_qca.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3\",\n                            \"lessThan\": \"a5414b0a9464b863733c8bd97493cb443a210ec4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3\",\n                            \"lessThan\": \"15754e4ec47ac5d117c9609c34a49ed6980ac4a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3\",\n                            \"lessThan\": \"4e93c65f87825e1e012bce56615320aeb123815d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/bluetooth/hci_qca.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a5414b0a9464b863733c8bd97493cb443a210ec4","https://git.kernel.org/stable/c/15754e4ec47ac5d117c9609c34a49ed6980ac4a1","https://git.kernel.org/stable/c/4e93c65f87825e1e012bce56615320aeb123815d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98294","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98294","identifiers":["CVE-2026-98294"]},"retained":false,"historicalAffected":[]}],"coverage":[]}