CVE-2023-53414
📋 TL;DR
This CVE describes a memory leak vulnerability in the Linux kernel's SNIC SCSI driver when using debugfs_lookup() without proper cleanup. The vulnerability allows gradual memory exhaustion over time, affecting systems running vulnerable Linux kernel versions with SNIC driver enabled. Attackers could potentially cause denial of service through resource exhaustion.
💻 Affected Systems
- Linux kernel with SNIC SCSI 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 →⚠️ Risk & Real-World Impact
Worst Case
System becomes unresponsive or crashes due to memory exhaustion, leading to denial of service and potential data loss or service disruption.
Likely Case
Gradual performance degradation over time as memory leaks accumulate, eventually requiring system restart to recover normal operation.
If Mitigated
Minimal impact with proper monitoring and restart procedures in place; memory leak would be detected and addressed before causing service disruption.
🎯 Exploit Status
Requires local access and ability to trigger debugfs operations; memory leak is gradual rather than immediate.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits: 3dec769caf337c55814fbf79ec8c91a3cce23bf3, 5a46d8bdaf03e8a4bb83f0c363326d9aa66cc122, 995424f59ab52fb432b26ccb3abced63745ea041, ad0e4e2fab928477f74d742e6e77d79245d3d3e7
Vendor Advisory: https://git.kernel.org/stable/c/
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify SNIC driver is using debugfs_lookup_and_remove() instead of debugfs_lookup() with manual dput().
🔧 Temporary Workarounds
Disable SNIC driver if not needed
linuxUnload SNIC driver module to prevent vulnerability exploitation
modprobe -r snic
Unmount debugfs
linuxRemove debugfs mount to prevent debugfs operations
umount /sys/kernel/debug
🧯 If You Can't Patch
- Monitor system memory usage for unusual increases and restart services if memory leak detected
- Implement strict access controls to prevent unauthorized local users from accessing debugfs
🔍 How to Verify
Check if Vulnerable:
Check if SNIC driver is loaded: lsmod | grep snic AND check kernel version against patched commitsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated AND check SNIC driver source code uses debugfs_lookup_and_remove()📡 Detection & Monitoring
Log Indicators:
- Kernel oom-killer events
- System memory exhaustion warnings
- SNIC driver error messages
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("Out of memory" OR "oom-killer" OR "snic")