CVE-2022-50374: Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-17 · updated 2026-06-17
Weakness: CWE-908

Description

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().

Affected products

Linux kernel: from 4.14.63 before 4.15; from 4.14.63 before 5.10.150; from 5.11 before 5.15.75; from 5.16 before 5.19.17; from 6.0 before 6.0.3 — fixed in 4.15, 5.10.150, 5.15.75, 5.19.17, 6.0.3

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 5.10.150, 5.15.75, 5.19.17. Check the vendor advisory for mitigations.

References

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