CVE-2025-38593
Description
A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition in the hci_discovery_filter_clear() function can lead to a double free vulnerability, which is a type of memory corruption. A local attacker could exploit this flaw to trigger a kernel bug, causing the system to crash and resulting in a Denial of Service (DoS).
Statement
This is a MODERATE impact flaw in the Linux kernel's Bluetooth Host Controller Interface (HCI) component. A race condition within the hci_discovery_filter_clear() function can lead to a double-free vulnerability, potentially causing a kernel crash due to a null pointer problem.
Mitigation
To mitigate this issue, prevent the `bluetooth` kernel module from loading. This can be achieved by creating a modprobe configuration file.
1. Create or edit `/etc/modprobe.d/disable-bluetooth.conf`:
install bluetooth /bin/true2. Unload the module if it is currently loaded:
bash3. Reboot the system for the changes to take full effect.
sudo modprobe -r bluetooth
Note that disabling the `bluetooth` module will prevent all Bluetooth functionality on the system.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 7.8 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | High | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation.
Integrity,Confidentiality
Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory
In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution.
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