CVE-2024-56654: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating The usage of rcu_read_(un)lock while inside list_for_each_entry_rcu is not safe since for the most part entries fetched this way shall be treated as rcu_dereference: Note that the value returned by rcu_dereference() is valid only within the enclosing RCU read-side critical section [1]_. For example, the following is **not** legal:: rcu_read_lock(); p = rcu_dereference(head.next); rcu_read_unlock(); x = p->address; /* BUG!!! */ rcu_read_lock(); y = p->data; /* BUG!!! */ rcu_read_unlock();

Affected products

• Linux Linux Kernel: from 6.4.16, before 6.5 (fixed in 6.5); from 6.5.3, before 6.6.67 (fixed in 6.6.67); from 6.7, before 6.12.6 (fixed in 6.12.6); version 6.13 only

Published 2024-12-27. Last modified 2026-08-04.