CVE-2022-50343
📋 TL;DR
This vulnerability is a memory leak in the Linux kernel's RapidIO subsystem that occurs when device addition fails. It allows attackers to cause resource exhaustion over time, potentially leading to denial of service. Systems using RapidIO hardware with affected Linux kernel versions are vulnerable.
💻 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
Sustained exploitation could exhaust kernel memory, causing system instability, crashes, or denial of service requiring reboot.
Likely Case
Gradual memory consumption leading to performance degradation over time, particularly on systems with frequent RapidIO device operations.
If Mitigated
Minimal impact with proper monitoring and memory limits in place, though some resource waste may still occur.
🎯 Exploit Status
Exploitation requires ability to trigger RapidIO device addition failures, typically requiring local access or control of RapidIO hardware.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 3b4676f274a6b5d001176f15d0542100bbf4b59a and related fixes
Vendor Advisory: https://git.kernel.org/stable/c/3b4676f274a6b5d001176f15d0542100bbf4b59a
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager to update kernel package. 3. For custom kernels: Apply patches from kernel.org and rebuild.
🔧 Temporary Workarounds
Disable RapidIO support
allRemove RapidIO kernel module support if not needed
modprobe -r rapidio
echo 'blacklist rapidio' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Monitor kernel memory usage for unusual growth patterns
- Implement process and memory limits to contain potential resource exhaustion
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if RapidIO module is loaded: lsmod | grep rapidioCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or check with distribution's security advisory📡 Detection & Monitoring
Log Indicators:
- Kernel oom-killer messages
- Memory allocation failures in dmesg
- RapidIO error messages
Network Indicators:
- None - this is a local memory management issue
SIEM Query:
Search for kernel logs containing 'rapidio' errors or memory allocation failures🔗 References
- https://git.kernel.org/stable/c/3b4676f274a6b5d001176f15d0542100bbf4b59a
- https://git.kernel.org/stable/c/440afd7fd9b164fdde6fc9da8c47d3d7f20dcce8
- https://git.kernel.org/stable/c/80fad2e53eaed2b3a2ff596575f65669e13ceda5
- https://git.kernel.org/stable/c/85fbf58b15c09d3a6a03098c1e42ebfe9002f39d
- https://git.kernel.org/stable/c/88fa351b20ca300693a206ccd3c4b0e0647944d8
- https://git.kernel.org/stable/c/c413f65011ff8caffabcde0e1c3ceede48a48d6f
- https://git.kernel.org/stable/c/c482cb0deb57924335103fe592c379a076d867f8
- https://git.kernel.org/stable/c/ec3f04f74f50d0b6bac04d795c93c2b852753a7a
- https://git.kernel.org/stable/c/f9574cd48679926e2a569e1957a5a1bcc8a719ac
