CVE-2023-53657
📋 TL;DR
This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's ice network driver. An attacker could potentially cause a kernel panic or system crash by triggering network traffic before switchdev configuration is complete. Systems using Intel Ethernet Controller E800 Series with affected kernel versions are vulnerable.
💻 Affected Systems
- Linux kernel with ice network 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, potentially disrupting network connectivity and requiring system reboot.
Likely Case
System crash or kernel panic when specific network conditions trigger the uninitialized switchdev state, causing temporary service disruption.
If Mitigated
No impact if patched or if the specific network configuration that triggers the race condition is avoided.
🎯 Exploit Status
Exploitation requires triggering network traffic during a specific race condition window during driver initialization. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits 5760a72b3060150b587eff3e879648c7470efddd, 63ff5a94649837d980e3b9ef535c793ec8cb0ca7, or 7aa529a69e92b9aff585e569d5003f7c15d8d60b
Vendor Advisory: https://git.kernel.org/stable/c/5760a72b3060150b587eff3e879648c7470efddd
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel package. 3. Rebuild kernel if using custom kernel with the fix commits backported.
🔧 Temporary Workarounds
Disable switchdev configuration
LinuxPrevent the vulnerable code path by not enabling switchdev mode on affected Intel network interfaces
echo 0 > /sys/class/net/<interface>/switchdev/enable
🧯 If You Can't Patch
- Avoid network traffic during system boot/interface initialization periods
- Monitor system logs for kernel panic events and have recovery procedures ready
🔍 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 contains fix commits: git log --oneline | grep -E '5760a72b3060150b587eff3e879648c7470efddd|63ff5a94649837d980e3b9ef535c793ec8cb0ca7|7aa529a69e92b9aff585e569d5003f7c15d8d60b'📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/messages or dmesg
- NULL pointer dereference errors mentioning ice_eswitch_port_start_xmit
Network Indicators:
- Sudden loss of network connectivity on affected interfaces
SIEM Query:
event_source:kernel AND (message:"ice_eswitch_port_start_xmit" OR message:"NULL pointer dereference" OR message:"kernel panic")