CVE-2022-48966
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in the Linux kernel's mvneta network driver. An attacker with local access can trigger this vulnerability by providing specially crafted input to the RSS configuration interface, potentially leading to kernel memory disclosure or system instability. Systems using affected Linux kernel versions with the mvneta driver enabled 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 →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 memory disclosure leading to information leakage, potential privilege escalation if combined with other vulnerabilities, or system crash/denial-of-service.
Likely Case
Local information disclosure of kernel memory contents or system instability/crash.
If Mitigated
Minimal impact with proper access controls preventing local attackers from accessing the vulnerable interface.
🎯 Exploit Status
Requires local access and ability to interact with the mvneta RSS configuration interface. No public exploit code identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in Linux kernel stable trees (commits referenced in CVE)
Vendor Advisory: https://git.kernel.org/stable/c/146ebee8fcdb349d7ec0e49915e6cdafb92544ae
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable mvneta driver
linuxIf not needed, disable the vulnerable mvneta network driver module
echo 'blacklist mvneta' >> /etc/modprobe.d/blacklist.conf
rmmod mvneta
Restrict access to kernel interfaces
linuxImplement strict access controls to prevent unauthorized users from accessing kernel configuration interfaces
🧯 If You Can't Patch
- Implement strict user access controls to prevent local users from accessing kernel configuration interfaces
- Monitor system logs for unusual kernel activity or crashes related to network configuration
🔍 How to Verify
Check if Vulnerable:
Check if mvneta driver is loaded: lsmod | grep mvneta. Check kernel version against patched versions from distribution vendor.Check Version:
uname -rVerify Fix Applied:
Verify kernel version after update matches patched version. Confirm mvneta driver still functions properly if required.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes during network configuration changes
- Unusual kernel module loading/unloading
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for kernel panic logs or module-related errors in system logs🔗 References
- https://git.kernel.org/stable/c/146ebee8fcdb349d7ec0e49915e6cdafb92544ae
- https://git.kernel.org/stable/c/3ceffb8f410b93553fb16fe7e84aa0d35b3ba79b
- https://git.kernel.org/stable/c/47a1a2f6cd5ec3a4f8a2d9bfa1e0605347cdb92c
- https://git.kernel.org/stable/c/5a142486a0db6b0b85031f22d69acd0cdcf8f72b
- https://git.kernel.org/stable/c/6ca0a506dddc3e1d636935eef339576b263bf3d8
- https://git.kernel.org/stable/c/a6b30598fec84f8809f5417cde73071ca43e8471
- https://git.kernel.org/stable/c/e8b4fc13900b8e8be48debffd0dfd391772501f7
- https://git.kernel.org/stable/c/eec1fc21edc2bb99c9e66cf66f0b5d4d643fbb50
