CVE-2023-53398
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's mlx5 driver PTP queue implementation allows attackers to potentially execute arbitrary code or cause system crashes. This affects systems using Mellanox network adapters with the vulnerable driver. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Linux kernel with mlx5 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 privilege escalation leading to full system compromise, arbitrary code execution, or persistent denial of service.
Likely Case
Local privilege escalation allowing attackers to gain root privileges or cause kernel panics/crashes.
If Mitigated
Limited impact with proper access controls preventing local user access to vulnerable systems.
🎯 Exploit Status
Requires local access and knowledge of kernel exploitation techniques. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions containing the stable commits listed in references
Vendor Advisory: https://git.kernel.org/stable/c/3a50cf1e8e5157b82268eee7e330dbe5736a0948
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing fixes. 2. Reboot system. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable PTP functionality
linuxDisable Precision Time Protocol functionality in mlx5 driver if not required
echo 'options mlx5_core ptp_enable=0' > /etc/modprobe.d/mlx5-ptp-disable.conf
rmmod mlx5_core
modprobe mlx5_core
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable drivers
- Implement strict privilege separation and limit user capabilities
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if mlx5 driver is loaded: uname -r && lsmod | grep mlx5Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check git commit history for the fix commits📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes/panics
- mlx5 driver error messages in dmesg
Network Indicators:
- Unusual local privilege escalation attempts
SIEM Query:
source="kernel" AND ("mlx5" OR "PTP") AND ("panic" OR "oops" OR "use-after-free")