{"id":"CVE-2022-48871","summary":"tty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer\n\nDriver's probe allocates memory for RX FIFO (port-\u003erx_fifo) based on\ndefault RX FIFO depth, e.g. 16.  Later during serial startup the\nqcom_geni_serial_port_setup() updates the RX FIFO depth\n(port-\u003erx_fifo_depth) to match real device capabilities, e.g. to 32.\n\nThe RX UART handle code will read \"port-\u003erx_fifo_depth\" number of words\ninto \"port-\u003erx_fifo\" buffer, thus exceeding the bounds.  This can be\nobserved in certain configurations with Qualcomm Bluetooth HCI UART\ndevice and KASAN:\n\n  Bluetooth: hci0: QCA Product ID   :0x00000010\n  Bluetooth: hci0: QCA SOC Version  :0x400a0200\n  Bluetooth: hci0: QCA ROM Version  :0x00000200\n  Bluetooth: hci0: QCA Patch Version:0x00000d2b\n  Bluetooth: hci0: QCA controller version 0x02000200\n  Bluetooth: hci0: QCA Downloading qca/htbtfw20.tlv\n  bluetooth hci0: Direct firmware load for qca/htbtfw20.tlv failed with error -2\n  Bluetooth: hci0: QCA Failed to request file: qca/htbtfw20.tlv (-2)\n  Bluetooth: hci0: QCA Failed to download patch (-2)\n  ==================================================================\n  BUG: KASAN: slab-out-of-bounds in handle_rx_uart+0xa8/0x18c\n  Write of size 4 at addr ffff279347d578c0 by task swapper/0/0\n\n  CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.0-rt5-00350-gb2450b7e00be-dirty #26\n  Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)\n  Call trace:\n   dump_backtrace.part.0+0xe0/0xf0\n   show_stack+0x18/0x40\n   dump_stack_lvl+0x8c/0xb8\n   print_report+0x188/0x488\n   kasan_report+0xb4/0x100\n   __asan_store4+0x80/0xa4\n   handle_rx_uart+0xa8/0x18c\n   qcom_geni_serial_handle_rx+0x84/0x9c\n   qcom_geni_serial_isr+0x24c/0x760\n   __handle_irq_event_percpu+0x108/0x500\n   handle_irq_event+0x6c/0x110\n   handle_fasteoi_irq+0x138/0x2cc\n   generic_handle_domain_irq+0x48/0x64\n\nIf the RX FIFO depth changes after probe, be sure to resize the buffer.","modified":"2026-04-02T08:27:06.309375Z","published":"2024-08-21T06:10:01.859Z","related":["SUSE-SU-2024:3190-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3227-1","SUSE-SU-2024:3408-1","SUSE-SU-2024:3483-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48871.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/894681682dbefdad917b88f86cde1069140a047a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8caf69a6946e18ffebad49847e258f5b6d52ac2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb53a3366eb28fed67850c80afa52075bb71a38a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd524ca7fe45b8a06dca2dd546d62684a9768f95"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48871.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48871"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f9d690b6ece7ec9a6ff6b588df95a010ab2d66f9"},{"fixed":"894681682dbefdad917b88f86cde1069140a047a"},{"fixed":"cb53a3366eb28fed67850c80afa52075bb71a38a"},{"fixed":"fd524ca7fe45b8a06dca2dd546d62684a9768f95"},{"fixed":"b8caf69a6946e18ffebad49847e258f5b6d52ac2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48871.json"}}],"schema_version":"1.7.5"}