CVE-2023-53279
📋 TL;DR
A memory leak vulnerability in the Linux kernel's VMware balloon driver occurs when debugfs_lookup() is called without proper cleanup. This affects Linux systems running vulnerable kernel versions with the vmw_balloon module loaded. The vulnerability allows gradual memory exhaustion over time.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Sustained exploitation could lead to kernel memory exhaustion, causing system instability, denial of service, or potential kernel crashes.
Likely Case
Gradual memory leak over extended periods, potentially causing performance degradation or system instability requiring reboots.
If Mitigated
Minimal impact with proper monitoring and memory management controls in place.
🎯 Exploit Status
Requires local access and ability to trigger debugfs operations on the vulnerable module
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the referenced git commits
Vendor Advisory: https://git.kernel.org/stable/c/209cdbd07cfaa4b7385bad4eeb47e5ec1887d33d
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Reboot system. 3. Verify vmw_balloon module loads correctly.
🔧 Temporary Workarounds
Unload vmw_balloon module
LinuxPrevent exploitation by unloading the vulnerable kernel module
sudo rmmod vmw_balloon
Blacklist vmw_balloon module
LinuxPrevent module from loading at boot
echo 'blacklist vmw_balloon' | sudo tee /etc/modprobe.d/blacklist-vmw_balloon.conf
🧯 If You Can't Patch
- Monitor system memory usage for unusual patterns
- Implement strict access controls to prevent unauthorized local access
🔍 How to Verify
Check if Vulnerable:
Check if vmw_balloon module is loaded: lsmod | grep vmw_balloonCheck Version:
uname -rVerify Fix Applied:
Check kernel version against patched versions and verify vmw_balloon module loads without errors📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- Memory allocation failures in kernel logs
- System instability logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic or oops events related to memory allocation