CVE-2022-49218
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in the Linux kernel's DisplayPort helper code. An attacker could potentially read kernel memory beyond the allocated buffer, which could lead to information disclosure or system crashes. This affects Linux systems with DisplayPort hardware and the vulnerable kernel versions.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure leading to privilege escalation or system crash/DoS
Likely Case
System instability or crash when handling DisplayPort connections
If Mitigated
No impact if patched or without DisplayPort hardware
🎯 Exploit Status
Requires triggering the specific DisplayPort register handling code path
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits a2151490cc6c57b368d7974ffd447a8b36ade639 and aeaed9a9fe694f8b1462fb81e2d33298c929180b)
Vendor Advisory: https://git.kernel.org/stable/c/a2151490cc6c57b368d7974ffd447a8b36ade639
Restart Required: Yes
Instructions:
1. Update to patched kernel version from your distribution's repositories
2. Rebuild kernel if using custom kernel
3. Reboot system to load new kernel
🔧 Temporary Workarounds
Disable DisplayPort functionality
allRemove or disable DisplayPort hardware if not needed
🧯 If You Can't Patch
- Restrict physical access to DisplayPort ports
- Monitor for kernel crashes or unusual system behavior
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if DisplayPort hardware is presentCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than patched version📡 Detection & Monitoring
Log Indicators:
- Kernel oops/panic messages
- System crashes when using DisplayPort
SIEM Query:
Search for kernel panic or oops messages in system logs