CVE-2024-50226
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's CXL (Compute Express Link) subsystem allows local attackers to cause a kernel crash or potentially execute arbitrary code. This affects systems with CXL hardware support enabled in the kernel, primarily servers and workstations with CXL memory expansion devices.
💻 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 →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, leading to complete system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
No impact if CXL hardware is not present or the subsystem is not loaded.
🎯 Exploit Status
Requires local access and ability to trigger CXL decoder teardown sequences. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the fix commits
Vendor Advisory: https://git.kernel.org/stable/c/101c268bd2f37e965a5468353e62d154db38838e
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing fixes. 2. For distributions: Use package manager (apt/yum/dnf) to install latest kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable CXL subsystem
linuxPrevent loading of CXL kernel module if not needed
echo 'blacklist cxl_core' >> /etc/modprobe.d/blacklist-cxl.conf
rmmod cxl_core
🧯 If You Can't Patch
- Restrict local user access to systems with CXL hardware
- Monitor for kernel panic/crash events related to CXL operations
🔍 How to Verify
Check if Vulnerable:
Check if CXL module is loaded: lsmod | grep cxl_core. If loaded and kernel version is before fixes, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Check kernel version includes fix commits or is newer than vulnerable versions. Verify CXL operations work without crashes.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages mentioning CXL, use-after-free, or general protection faults
- System crashes during CXL device removal/teardown
Network Indicators:
- None - local vulnerability only
SIEM Query:
kernel:panic AND (cxl OR decoder OR use-after-free)