CVE-2022-48706
📋 TL;DR
This CVE describes a memory leak vulnerability in the Linux kernel's vDPA (Virtual Data Path Acceleration) IFCVF driver. When initialization fails, the driver doesn't properly clean up allocated memory, potentially leading to resource exhaustion. This affects systems using Linux kernels with the vulnerable vDPA IFCVF driver.
💻 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
Sustained exploitation could lead to kernel memory exhaustion, causing system instability, denial of service, or potential kernel crashes.
Likely Case
Memory leak gradually consumes kernel resources, potentially leading to performance degradation or system instability over time.
If Mitigated
With proper kernel memory management controls and monitoring, impact is limited to minor resource consumption during driver initialization failures.
🎯 Exploit Status
Exploitation requires ability to trigger driver initialization failures, which may require specific hardware or configuration conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 5d2cc32c1c10bd889125d2adc16a6bc3338dcd3e and 6b04456e248761cf68f562f2fd7c04e591fcac94
Vendor Advisory: https://git.kernel.org/stable/c/5d2cc32c1c10bd889125d2adc16a6bc3338dcd3e
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Rebuild kernel if compiling from source. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable vDPA IFCVF driver
linuxPrevent loading of vulnerable driver module
echo 'blacklist ifcvf' >> /etc/modprobe.d/blacklist.conf
rmmod ifcvf
🧯 If You Can't Patch
- Monitor kernel memory usage for unusual patterns indicating memory leaks
- Restrict access to systems to prevent unauthorized users from triggering driver initialization
🔍 How to Verify
Check if Vulnerable:
Check if ifcvf driver is loaded: lsmod | grep ifcvf AND check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: grep -q '5d2cc32c1c10bd889125d2adc16a6bc3338dcd3e\|6b04456e248761cf68f562f2fd7c04e591fcac94' /proc/version📡 Detection & Monitoring
Log Indicators:
- Kernel oom-killer messages
- Memory allocation failures in dmesg
- Driver initialization failure logs
SIEM Query:
source="kernel" AND ("oom-killer" OR "memory allocation failure" OR "ifcvf init failed")