CVE-2024-53043
📋 TL;DR
A NULL pointer dereference vulnerability in the Linux kernel's MCTP I2C subsystem could cause kernel panics or system crashes when processing network packets with missing address information. This affects Linux systems using MCTP over I2C protocol. Attackers could potentially cause denial of service by sending specially crafted packets.
💻 Affected Systems
- Linux kernel
📦 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 →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 and denial of service, potentially requiring physical intervention to restore service.
Likely Case
System crash or kernel panic requiring reboot, causing temporary service disruption.
If Mitigated
No impact if system doesn't use MCTP over I2C or has proper network segmentation.
🎯 Exploit Status
Requires network access to MCTP I2C interface and ability to craft packets with NULL address headers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel branches (see git references)
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. For Debian systems: apt update && apt upgrade linux-image-*. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable MCTP I2C
linuxDisable MCTP over I2C subsystem if not required
modprobe -r mctp_i2c
echo 'blacklist mctp_i2c' >> /etc/modprobe.d/blacklist.conf
Network segmentation
linuxIsolate MCTP I2C interfaces from untrusted networks
iptables -A INPUT -p mctp -j DROP
firewall-cmd --permanent --add-rich-rule='rule protocol value=mctp drop'
🧯 If You Can't Patch
- Implement strict network access controls to MCTP I2C interfaces
- Monitor system logs for kernel panic events and implement high availability solutions
🔍 How to Verify
Check if Vulnerable:
Check if MCTP I2C module is loaded: lsmod | grep mctp_i2cCheck Version:
uname -rVerify Fix Applied:
Check kernel version after update: uname -r and verify it includes the fix📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- System crash/reboot events
Network Indicators:
- Unusual MCTP packet traffic to I2C interfaces
SIEM Query:
source="kernel" AND "panic" OR "Oops" AND "mctp" OR "i2c"🔗 References
- https://git.kernel.org/stable/c/01e215975fd80af81b5b79f009d49ddd35976c13
- https://git.kernel.org/stable/c/4707893315802a0917231b94cb20cbe50ccbfe03
- https://git.kernel.org/stable/c/8c222adadc1612e4f097688875962a28e3f5ab44
- https://git.kernel.org/stable/c/8e886e44397ba89f6e8da8471386112b4f5b67b7
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
