CVE-2022-49516
📋 TL;DR
This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's Intel Ethernet Connection (ice) driver. The vulnerability occurs when the driver fails to check for NULL return values from the ice_get_vf_vsi function, potentially causing kernel crashes or denial of service. This affects systems using Intel Ethernet 800 Series network adapters with SR-IOV virtualization enabled.
💻 Affected Systems
- Linux kernel with Intel Ethernet Connection (ice) 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and complete denial of service, potentially requiring physical reboot.
Likely Case
Kernel oops or system instability when handling VF messages during network adapter resets.
If Mitigated
Minor performance impact from additional NULL checks with no security impact.
🎯 Exploit Status
Exploitation requires ability to trigger specific driver operations during VF VSI transitions, typically requiring local access or VM control.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits baeb705fd6a7245cc1fa69ed991a9cffdf44a174 and e7be3877589d539c52e5d1d23a625f889b541b9d
Vendor Advisory: https://git.kernel.org/stable/c/baeb705fd6a7245cc1fa69ed991a9cffdf44a174
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable SR-IOV
linuxDisable Single Root I/O Virtualization on affected Intel Ethernet adapters
echo 0 > /sys/class/net/<interface>/device/sriov_numvfs
Use alternative network driver
linuxUse different network driver if available for the hardware
modprobe -r ice
modprobe alternative_driver
🧯 If You Can't Patch
- Restrict access to systems with affected configurations to trusted users only
- Monitor system logs for kernel oops or crashes related to ice driver
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if ice driver is loaded: lsmod | grep ice && uname -rCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or is newer than vulnerable versions📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages mentioning ice driver
- System crashes during network operations
- dmesg output showing NULL pointer dereference
Network Indicators:
- Unexpected network interface resets
- VF connectivity issues
SIEM Query:
source="kernel" AND ("ice" OR "NULL pointer") AND ("dereference" OR "oops" OR "panic")