CVE-2022-48883
📋 TL;DR
A Linux kernel vulnerability in the mlx5e IPoIB driver allows out-of-bounds memory access when creating child PKEY interfaces with fewer receive queues than the parent interface. This affects systems using Mellanox network adapters with IPoIB configuration. Attackers with local access could potentially crash the system or execute arbitrary code.
💻 Affected Systems
- Linux kernel with mlx5e IPoIB 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
Local privilege escalation leading to kernel compromise, system crash, or arbitrary code execution with kernel privileges.
Likely Case
Kernel panic or system crash causing denial of service on affected systems.
If Mitigated
No impact if interfaces are properly configured or the system is patched.
🎯 Exploit Status
Requires local access and knowledge of IPoIB interface configuration. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 31c70bfe58ef09fe36327ddcced9143a16e9e83d or 5844a46f09f768da866d6b0ffbf1a9073266bf24
Vendor Advisory: https://git.kernel.org/stable/c/31c70bfe58ef09fe36327ddcced9143a16e9e83d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check distribution-specific security advisories. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Restrict IPoIB interface creation
linuxLimit ability to create IPoIB interfaces via netlink to prevent exploitation
echo 'kernel.yama.ptrace_scope = 1' >> /etc/sysctl.conf
sysctl -p
Disable unnecessary IPoIB interfaces
linuxRemove or disable IPoIB interfaces that are not required
ip link delete <interface_name>
ifconfig <interface_name> down
🧯 If You Can't Patch
- Restrict local user access to systems with Mellanox adapters
- Implement strict change control for network interface configuration
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if mlx5e IPoIB driver is loaded: 'uname -r' and 'lsmod | grep mlx5'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: 'uname -r' and check distribution patch notes📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Out of bounds memory access errors in dmesg
- Failed IPoIB interface creation attempts
Network Indicators:
- Unusual IPoIB interface creation patterns
- Network service disruptions on Mellanox interfaces
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "mlx5e" OR "IPoIB")