CVE-2024-56654

Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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();

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();

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2024-12-27 CVE Reserved
2024-12-27 CVE Published
2025-01-20 CVE Updated
2025-03-18 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/a0bfde167b506423111ddb8cd71930497a40fc54	Vuln. Introduced
https://git.kernel.org/stable/c/b475c1109251e30ec21fb574d72a1c71a4ab0039	Vuln. Introduced
https://git.kernel.org/stable/c/2ccde10127447c1a5caad8469fede945bdb62fdf	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/0108132d7d76d884e443d18b4f067cdf2811911b	2024-12-19
https://git.kernel.org/stable/c/f9ecc90b5d501b3a5a62d0685d5104f934bb0104	2024-12-19
https://git.kernel.org/stable/c/581dd2dc168fe0ed2a7a5534a724f0d3751c93ae	2024-12-12

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6 < 6.6.67 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.6.67"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6 < 6.12.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.12.6"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6 < 6.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.13"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.4.16 Search vendor "Linux" for product "Linux Kernel" and version "6.4.16"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.5.3 Search vendor "Linux" for product "Linux Kernel" and version "6.5.3"		en		Affected