CVE-2022-50137
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's RDMA subsystem (irdma driver). An attacker could potentially exploit this to cause a kernel crash or execute arbitrary code with kernel privileges. Systems using RDMA (Remote Direct Memory Access) with the irdma driver are affected.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash or potential arbitrary code execution with kernel privileges, resulting in complete system compromise.
Likely Case
Kernel crash causing system instability or denial of service, requiring a reboot to restore functionality.
If Mitigated
Limited impact if RDMA is not used or if the system is properly segmented, though kernel crashes could still occur if exploited.
🎯 Exploit Status
Exploitation requires local access to trigger the race condition. No public exploits are known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in kernel stable releases (commits: 0abf2eef80295923b819ce89ff9edc1fe61be17c, 350ac793a03c8a30a3f2b27fc282cd1c67070763, 8ecef7890b3aea78c8bbb501a4b5b8134367b821, 92520864ef9f912f38b403d172a0ded020683d55)
Vendor Advisory: https://git.kernel.org/stable/c/0abf2eef80295923b819ce89ff9edc1fe61be17c
Restart Required: Yes
Instructions:
1. Update Linux kernel to a version containing the fix. 2. Reboot the system to load the new kernel. 3. Verify the patch is applied by checking kernel version or commit hash.
🔧 Temporary Workarounds
Disable RDMA
linuxIf RDMA is not required, disable it to remove the attack surface.
modprobe -r irdma
echo 'blacklist irdma' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Restrict access to systems using RDMA to trusted users only.
- Implement strict network segmentation to isolate RDMA traffic.
🔍 How to Verify
Check if Vulnerable:
Check if the irdma module is loaded: lsmod | grep irdma. If loaded and kernel version is unpatched, system may be vulnerable.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to a patched release and irdma module is from patched kernel.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs, oops messages, or crashes related to RDMA or irdma driver
Network Indicators:
- Unusual RDMA traffic patterns or connections
SIEM Query:
Search for kernel panic events or module load/unload events for irdma