CVE-2022-48907
📋 TL;DR
This CVE describes a memory leak vulnerability in the Linux kernel's auxdisplay lcd2s driver. When the driver's remove() function is called, it fails to free allocated memory, causing gradual resource exhaustion. This affects Linux systems using the lcd2s auxdisplay driver.
💻 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
Sustained exploitation could lead to kernel memory exhaustion, causing system instability, crashes, or denial of service.
Likely Case
Gradual memory consumption over time when the driver is loaded/unloaded repeatedly, potentially leading to performance degradation.
If Mitigated
Minimal impact with proper monitoring and memory management controls in place.
🎯 Exploit Status
Exploitation requires local access and ability to trigger driver removal. No known public exploits exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 3585ed5f9b11a6094dd991d76a1541e5d03b986a, 5d53cd33f4253aa4cf02bf7e670b3c6a99674351, or 898c0a15425a5bcaa8d44bd436eae5afd2483796
Vendor Advisory: https://git.kernel.org/stable/c/3585ed5f9b11a6094dd991d76a1541e5d03b986a
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify driver is no longer loaded or has been updated.
🔧 Temporary Workarounds
Disable lcd2s driver
linuxPrevent loading of the vulnerable driver module
echo 'blacklist lcd2s' >> /etc/modprobe.d/blacklist.conf
rmmod lcd2s
🧯 If You Can't Patch
- Monitor system memory usage for abnormal consumption patterns
- Restrict local access to prevent potential exploitation
🔍 How to Verify
Check if Vulnerable:
Check if lcd2s driver is loaded: lsmod | grep lcd2s. If loaded and kernel version is before fix commits, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits and lcd2s driver loads without memory leaks in testing.📡 Detection & Monitoring
Log Indicators:
- Kernel OOM (Out of Memory) messages
- System memory exhaustion warnings
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("out of memory" OR "OOM" OR "memory allocation failure")