CVE-2024-27000: serial: mxs-auart: add spinlock around changing cts state

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-01 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: serial: mxs-auart: add spinlock around changing cts state The uart_handle_cts_change() function in serial_core expects the caller to hold uport->lock. For example, I have seen the below kernel splat, when the Bluetooth driver is loaded on an i.MX28 board. [ 85.119255] ------------[ cut here ]------------ [ 85.124413] WARNING: CPU: 0 PID: 27 at /drivers/tty/serial/serial_core.c:3453 uart_handle_cts_change+0xb4/0xec [ 85.134694] Modules linked in: hci_uart bluetooth ecdh_generic ecc wlcore_sdio configfs [ 85.143314] CPU: 0 PID: 27 Comm: kworker/u3:0 Not tainted 6.6.3-00021-gd62a2f068f92 #1 [ 85.151396] Hardware name: Freescale MXS (Device Tree) [ 85.156679] Workqueue: hci0 hci_power_on [bluetooth] (...) [ 85.191765] uart_handle_cts_change from mxs_auart_irq_handle+0x380/0x3f4 [ 85.198787] mxs_auart_irq_handle from __handle_irq_event_percpu+0x88/0x210 (...)

Affected products

Debian Linux: 10.0
Fedoraproject Fedora: 38, 39, 40
Linux kernel: from 3.18 before 4.19.313; from 4.20 before 5.4.275; from 5.5 before 5.10.216; from 5.11 before 5.15.158; from 5.16 before 6.1.88; from 6.2 before 6.6.29 — fixed in 4.19.313, 5.10.216, 5.15.158, 5.4.275, 6.1.88, 6.6.29

How to fix

Upgrade to a fixed version: Linux kernel 4.19.313, 5.10.216, 5.15.158, 5.4.275. Check the vendor advisory for mitigations.

References

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