CVE-2022-49312
📋 TL;DR
This is a memory leak vulnerability in the Linux kernel's rtl8712 WiFi driver. When driver initialization fails, allocated memory isn't properly freed, potentially leading to resource exhaustion. Systems using the affected rtl8712 driver for Realtek WiFi chips are vulnerable.
💻 Affected Systems
- Linux kernel with rtl8712 staging driver
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Sustained exploitation could cause kernel memory exhaustion leading to system instability, denial of service, or kernel panic.
Likely Case
Memory leak during driver initialization failures, causing gradual resource consumption and potential system performance degradation.
If Mitigated
Minimal impact with proper memory management and monitoring in place.
🎯 Exploit Status
Exploitation requires triggering specific driver initialization failure conditions, making it difficult to weaponize effectively.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions containing the fix commits (205e039fead72e87ad2838f5e649a4c4834f648b and related)
Vendor Advisory: https://git.kernel.org/stable/c/205e039fead72e87ad2838f5e649a4c4834f648b
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable rtl8712 driver
linuxPrevent loading of vulnerable driver module
echo 'blacklist r8712u' >> /etc/modprobe.d/blacklist.conf
rmmod r8712u
🧯 If You Can't Patch
- Monitor system memory usage for unusual patterns
- Avoid using Realtek 8712 USB WiFi adapters on affected systems
🔍 How to Verify
Check if Vulnerable:
Check if r8712u module is loaded: lsmod | grep r8712uCheck Version:
uname -rVerify Fix Applied:
Check kernel version against patched versions or verify the fix commit is present in kernel source📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- Memory allocation failures in kernel logs
- Driver initialization errors
SIEM Query:
kernel: *r8712* OR *rtl8712* AND (error OR fail OR panic)🔗 References
- https://git.kernel.org/stable/c/205e039fead72e87ad2838f5e649a4c4834f648b
- https://git.kernel.org/stable/c/5a89a92efc342dd7c44b6056da87debc598f9c73
- https://git.kernel.org/stable/c/7288ff561de650d4139fab80e9cb0da9b5b32434
- https://git.kernel.org/stable/c/8eb42d6d10f8fe509117859defddf9e72b4fa4d0
- https://git.kernel.org/stable/c/a2882b8baad068d21c99fb2ab5a85a2bdbd5b834
