CVE-2022-49711
📋 TL;DR
This is a use-after-free vulnerability in the Linux kernel's fsl-mc-bus driver that allows local attackers to potentially execute arbitrary code or crash the system. It affects Linux systems using Freescale/NXP Management Complex (MC) bus functionality. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Linux kernel
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to complete system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
Limited impact if proper access controls prevent local attackers from accessing vulnerable systems.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory layout. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel stable versions containing commit 161b68b0a728377aaa10a8e14c70e7734f3c9ff7 or later
Vendor Advisory: https://git.kernel.org/stable/c/161b68b0a728377aaa10a8e14c70e7734f3c9ff7
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commit 2. Reboot system to load new kernel 3. Verify kernel version after reboot
🔧 Temporary Workarounds
Disable fsl-mc-bus module
linuxPrevent loading of vulnerable kernel module if not required
echo 'blacklist fsl_mc_bus' >> /etc/modprobe.d/blacklist-fsl-mc-bus.conf
rmmod fsl_mc_bus
🧯 If You Can't Patch
- Restrict local user access to systems using Freescale/NXP MC bus functionality
- Implement strict privilege separation and limit users who can access kernel interfaces
🔍 How to Verify
Check if Vulnerable:
Check if fsl_mc_bus module is loaded: lsmod | grep fsl_mc_busCheck Version:
uname -rVerify Fix Applied:
Check kernel version contains fix commit: grep -q '161b68b0a728377aaa10a8e14c70e7734f3c9ff7' /proc/version📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- KASAN use-after-free reports in dmesg
- System crash/reboot logs
Network Indicators:
- None - local exploit only
SIEM Query:
source="kernel" AND ("KASAN: use-after-free" OR "fsl_mc_bus" AND panic)