{"cve":"CVE-2024-46706","nvd":{"published":"2024-09-13T07:15:05.560","modified":"2026-06-17T07:55:46.013","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: fsl_lpuart: mark last busy before uart_add_one_port\n\nWith \"earlycon initcall_debug=1 loglevel=8\" in bootargs, kernel\nsometimes boot hang. It is because normal console still is not ready,\nbut runtime suspend is called, so early console putchar will hang\nin waiting TRDE set in UARTSTAT.\n\nThe lpuart driver has auto suspend delay set to 3000ms, but during\nuart_add_one_port, a child device serial ctrl will added and probed with\nits pm runtime enabled(see serial_ctrl.c).\nThe runtime suspend call path is:\ndevice_add\n     |-> bus_probe_device\n           |->device_initial_probe\n\t           |->__device_attach\n                         |-> pm_runtime_get_sync(dev->parent);\n\t\t\t |-> pm_request_idle(dev);\n\t\t\t |-> pm_runtime_put(dev->parent);\n\nSo in the end, before normal console ready, the lpuart get runtime\nsuspended. And earlycon putchar will hang.\n\nTo address the issue, mark last busy just after pm_runtime_enable,\nthree seconds is long enough to switch from bootconsole to normal\nconsole.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/3ecf625d4acb71d726bc0b49403cf68388b3d58d","https://git.kernel.org/stable/c/8eb92cfca6c2c5a15ab1773f3d18ab8d8f7dbb68","https://git.kernel.org/stable/c/dc98d76a15bc29a9a4e76f2f65f39f3e590fb15c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:54:38.012257375+00:00"},"epss":{"cve":"CVE-2024-46706","score":0.00215,"percentile":0.11974,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}