CVE-2024-42132 – This CVE-2024-42132 is a Linux kernel Bluetooth... (How to Fix)

Q: What is the severity of CVE-2024-42132?

CVE-2024-42132 has a CVSS score of 7.1 (HIGH). This CVE-2024-42132 is a Linux kernel Bluetooth vulnerability where an attacker can trigger a kernel warning by sending specially crafted Bluetooth Low Energy (LE) packets with invalid connection handles. This affects systems with Bluetooth functionality enabled, particularly those using the Linux kernel's Bluetooth stack. The vulnerability could lead to denial of service or potentially be leveraged for more severe attacks.

📋 TL;DR

This CVE-2024-42132 is a Linux kernel Bluetooth vulnerability where an attacker can trigger a kernel warning by sending specially crafted Bluetooth Low Energy (LE) packets with invalid connection handles. This affects systems with Bluetooth functionality enabled, particularly those using the Linux kernel's Bluetooth stack. The vulnerability could lead to denial of service or potentially be leveraged for more severe attacks.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific affected versions not explicitly stated in CVE description, but likely multiple recent Linux kernel versions before the fix.

Operating Systems: Linux distributions using vulnerable kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems with Bluetooth functionality enabled and using the vulnerable kernel code paths.

📦 What is this software?

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Kernel panic leading to system crash and denial of service, potentially allowing privilege escalation if combined with other vulnerabilities.

🟠

Likely Case

Kernel warning messages, system instability, or denial of service affecting Bluetooth functionality.

🟢

If Mitigated

Minor performance impact from kernel warnings with no system compromise.

🌐 Internet-Facing: LOW - Requires Bluetooth proximity or network access to Bluetooth services.

🏢 Internal Only: MEDIUM - Internal attackers with Bluetooth access could exploit this to disrupt services.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires Bluetooth access and knowledge of the vulnerability, but no authentication is needed once Bluetooth connectivity is established.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel versions with commits 1cc18c2ab2e8c54c355ea7c0423a636e415a0c23 and related fixes

Vendor Advisory: https://git.kernel.org/stable/c/1cc18c2ab2e8c54c355ea7c0423a636e415a0c23

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update. 4. Verify Bluetooth functionality post-update.

🔧 Temporary Workarounds

Disable Bluetooth

linux

Temporarily disable Bluetooth functionality to prevent exploitation

sudo systemctl stop bluetooth
sudo systemctl disable bluetooth
sudo rfkill block bluetooth

🧯 If You Can't Patch

Disable Bluetooth functionality completely on affected systems
Implement network segmentation to isolate Bluetooth-enabled devices

🔍 How to Verify

Check if Vulnerable:

Check kernel version and compare with patched versions from kernel git commits. Use 'uname -r' and verify against distribution security advisories.

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated to include the fix commits, then test Bluetooth functionality remains operational.

📡 Detection & Monitoring

Log Indicators:

Kernel warning messages related to hci_conn_del()
Bluetooth connection errors
System logs showing unexpected Bluetooth disconnections

Network Indicators:

Unusual Bluetooth LE connection attempts
Malformed Bluetooth packets

SIEM Query:

source="kernel" AND ("hci_conn_del" OR "Bluetooth warning" OR "kernel: WARNING")

📊 Metadata

CVE ID: CVE-2024-42132

CVSS v3 Score: 7.1 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CWE: CWE-763

Published: July 30, 2024

Last Updated: December 11, 2024

🔗 References

📤 Share & Export

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🔗 Related Vulnerabilities

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