CVE-2022-50374

Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure

Medium · published September 17, 2025

CVSS v3.1
5.5
EPSS
0%
Percentile
10.3
In the wild
Unconfirmed
What it is

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure

syzbot is reporting NULL pointer dereference at hci_uart_tty_close() [1],

for rcu_sync_enter() is called without rcu_sync_init() due to

hci_uart_tty_open() ignoring percpu_init_rwsem() failure.

While we are at it, fix that hci_uart_register_device() ignores

percpu_init_rwsem() failure and hci_uart_unregister_device() does not

call percpu_free_rwsem().

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00208 · 10.3th percentile
Published
2025-09-17T14:56Z
EPSS history
Timeline
  • 17 SEP 14:56Z
    Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure
    cvelistv5