CVE-2022-48964
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's RAVB Ethernet driver. An attacker could potentially exploit this to cause kernel memory corruption, leading to system crashes or arbitrary code execution with kernel privileges. This affects Linux systems using the RAVB driver for Gigabit Ethernet controllers.
💻 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 →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 privilege escalation leading to full system compromise, denial of service, or arbitrary code execution at kernel level.
Likely Case
System crash or kernel panic resulting in denial of service, requiring system reboot.
If Mitigated
Limited impact if proper kernel hardening and exploit mitigations are in place, though crashes may still occur.
🎯 Exploit Status
Exploitation requires local network access and specific conditions to trigger the use-after-free. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in stable kernel trees via commits 5a5a3e564de6a8db987410c5c2f4748d50ea82b8 and e63c681494dcc0527c625a0a4f59bf10259f5ee0
Vendor Advisory: https://git.kernel.org/stable/c/5a5a3e564de6a8db987410c5c2f4748d50ea82b8
Restart Required: Yes
Instructions:
1. Update to latest stable kernel version containing the fix. 2. For embedded systems: Rebuild kernel with patched ravb driver. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable RAVB driver
linuxIf RAVB Ethernet is not needed, disable the driver module
echo 'blacklist ravb' >> /etc/modprobe.d/blacklist.conf
rmmod ravb
🧯 If You Can't Patch
- Restrict network access to affected systems
- Implement strict network segmentation and monitoring
🔍 How to Verify
Check if Vulnerable:
Check if RAVB driver is loaded: lsmod | grep ravb AND check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than patched versions📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- OOPs messages related to ravb driver
- System crash/reboot events
Network Indicators:
- Unusual network traffic patterns to/from affected systems
SIEM Query:
source="kernel" AND ("ravb" OR "use-after-free" OR "kernel panic")