CVE-2022-50245
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's RapidIO subsystem. When kfifo_alloc() fails during device opening, the driver doesn't properly remove a private structure from a list, allowing attackers to potentially execute arbitrary code or crash the system. This affects Linux systems with RapidIO hardware support enabled.
💻 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 →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 attacker gains kernel privileges leading to full system compromise, data theft, or persistent backdoor installation.
Likely Case
Local attacker causes kernel panic leading to denial of service or potentially gains limited kernel code execution.
If Mitigated
Impact limited to denial of service if kernel hardening features like KASLR and SMAP are enabled.
🎯 Exploit Status
Requires local access and ability to trigger the specific error condition. Exploit would need to bypass kernel hardening protections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Multiple stable kernel versions with commits: 02d7d89f816951e0862147d751b1150d67aaebdd and others listed
Vendor Advisory: https://git.kernel.org/stable/c/02d7d89f816951e0862147d751b1150d67aaebdd
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable RapidIO support
linuxRemove RapidIO kernel module support if not needed
echo 'blacklist rio_mport_cdev' > /etc/modprobe.d/disable-rapidio.conf
rmmod rio_mport_cdev
🧯 If You Can't Patch
- Restrict local user access to systems with RapidIO hardware
- Implement kernel hardening features like SELinux/AppArmor to limit impact
🔍 How to Verify
Check if Vulnerable:
Check if RapidIO module is loaded: lsmod | grep rio_mport_cdev and check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and RapidIO module loads without errors in dmesg📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- OOPs messages mentioning rio_mport_cdev
- Use-after-free warnings in kernel logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("rio_mport_cdev" OR "rapidio" OR "UAF")🔗 References
- https://git.kernel.org/stable/c/02d7d89f816951e0862147d751b1150d67aaebdd
- https://git.kernel.org/stable/c/2a6c75adf8192f07ddcdd4a1a13488c890a73919
- https://git.kernel.org/stable/c/2ba06e57f933f0eac242e8b389433da1cc00d4d5
- https://git.kernel.org/stable/c/2dfd60724d271a6ab99f93f40f38f2ced1ddbb87
- https://git.kernel.org/stable/c/2f5cc7fd73fd6253cc71214f0dd499cc62feb469
- https://git.kernel.org/stable/c/311b488405ac45af46756b1c8f1d27007b68b07e
- https://git.kernel.org/stable/c/5ee850645e42f541ce1ea8130c2b27cc495f965c
- https://git.kernel.org/stable/c/a253dde0403a153075ffb254f6f7b2635e49e97a
- https://git.kernel.org/stable/c/cb87af2c19c0993f6e21f75b963a5599c5a73e76
