{"schema":"threatline.record/2","record":{"id":"CVE-2026-98294","aliases":[],"summary":"Bluetooth: hci_qca: Do not write to the serial port after it is closed","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->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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98294","source_modified_at":"2026-10-19T09:17:05.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3","lessThan":"a5414b0a9464b863733c8bd97493cb443a210ec4","status":"affected","versionType":"git"},{"version":"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3","lessThan":"15754e4ec47ac5d117c9609c34a49ed6980ac4a1","status":"affected","versionType":"git"},{"version":"fa9ad876b8e0ebd2b4367ef1580f89be64ebd5d3","lessThan":"4e93c65f87825e1e012bce56615320aeb123815d","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98294","source_modified_at":"2026-10-19T09:17:05.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98294","source_modified_at":"2026-10-19T09:17:05.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"15754e4ec47ac5d117c9609c34a49ed6980ac4a1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98294","source_modified_at":"2026-10-19T09:17:05.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4e93c65f87825e1e012bce56615320aeb123815d","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00173,"percentile":0.06446,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:53.338Z","modified_at":"2026-10-19T09:17:05.335Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98294","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:17:05.335Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98294","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/a5414b0a9464b863733c8bd97493cb443a210ec4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/15754e4ec47ac5d117c9609c34a49ed6980ac4a1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4e93c65f87825e1e012bce56615320aeb123815d"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:17:05.335Z","content_hash":"68f9bf5efdd46db26576f8563de04b192d696551a1107022a7873e12d8fba991"}}