CVE-2023-53340
📋 TL;DR
This vulnerability in the Linux kernel's mlx5 driver allows an array-index-out-of-bounds error when a DEVX command fails, potentially leading to kernel crashes or local privilege escalation. It affects systems using the mlx5 driver with DEVX enabled, typically in high-performance computing or cloud environments.
💻 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 →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 panic leading to system crash or local privilege escalation allowing full system compromise.
Likely Case
System instability or denial of service due to kernel crashes from malformed commands.
If Mitigated
Minimal impact if DEVX is disabled or systems are isolated; patching prevents exploitation.
🎯 Exploit Status
Exploitation likely involves crafting specific DEVX commands to cause failures; no public exploits reported yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions including commits 2a0a935fb64ee8af253b9c6133bb6702fb152ac2, 411e4d6caa7f7169192b8dacc8421ac4fd64a354, or d8b6f175235d7327b4e1b13216859e89496dfbd5.
Vendor Advisory: https://git.kernel.org/stable/c/2a0a935fb64ee8af253b9c6133bb6702fb152ac2
Restart Required: Yes
Instructions:
1. Update the Linux kernel to a patched version from your distribution's repository. 2. Reboot the system to load the new kernel.
🔧 Temporary Workarounds
Disable DEVX support
linuxPrevents the vulnerable code path by disabling DEVX commands in the mlx5 driver.
echo 'options mlx5_core devx=0' > /etc/modprobe.d/mlx5-disable-devx.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict access to systems using mlx5 driver to trusted users only.
- Monitor kernel logs for crashes or errors related to mlx5 or DEVX commands.
🔍 How to Verify
Check if Vulnerable:
Check if the kernel version is before the fix commits by examining kernel source or distribution patches; use 'uname -r' and compare with vendor advisories.Check Version:
uname -rVerify Fix Applied:
After patching, verify the kernel version includes one of the fix commits; check system logs for absence of mlx5-related crashes.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages, 'array-index-out-of-bounds' errors in dmesg or syslog related to mlx5_core.
Network Indicators:
- Unusual DEVX command traffic to mlx5 interfaces, though this is internal and not typically network-exposed.
SIEM Query:
source="kernel" AND ("mlx5" OR "DEVX") AND ("panic" OR "out-of-bounds" OR "error")