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

2024-05-0105:28:35

Linux

github.com

linux kernel

mxs-auart

spinlock

cts state

uart_handle_cts_change

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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
(...)

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "56434e295bd4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "21535ef0ac19",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "0dc0637e6b16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "479244d68f5d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "2c9b943e9924",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "5f40fd6ca2cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "94b0e65c75f4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4d90bb147ef6",
        "lessThan": "54c4ec5f8c47",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/tty/serial/mxs-auart.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.18",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.19.313",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.275",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.216",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.158",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.88",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.29",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.8",
        "versionType": "custom",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/tty/serial/mxs-auart.c"
    ],
    "defaultStatus": "affected"
  }
]