CVE-2023-1652
📋 TL;DR
A use-after-free vulnerability in the NFS server implementation in the Linux kernel allows a local attacker to crash the system or potentially leak kernel memory. This affects systems running vulnerable Linux kernel versions with NFS server functionality enabled. Attackers need local access to exploit this flaw.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, or kernel memory disclosure that could aid further exploitation.
Likely Case
System crash or instability requiring reboot, causing temporary service disruption.
If Mitigated
Minimal impact if proper access controls prevent local attacker access to NFS server functionality.
🎯 Exploit Status
Requires local access and knowledge of kernel exploitation techniques. No public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel fixes available in distributions' security updates (e.g., RHEL, Ubuntu, Debian security advisories)
Vendor Advisory: https://access.redhat.com/security/cve/cve-2023-1652
Restart Required: Yes
Instructions:
1. Check your distribution's security advisory. 2. Update kernel package via package manager. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable NFS Server
linuxStop and disable nfs-server service if not required
sudo systemctl stop nfs-server
sudo systemctl disable nfs-server
🧯 If You Can't Patch
- Restrict local user access to systems running NFS server
- Implement strict access controls and monitoring for NFS server systems
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if nfs-server is running: 'uname -r' and 'systemctl status nfs-server'Check Version:
uname -rVerify Fix Applied:
Verify kernel version after update and ensure nfs-server is stopped or updated kernel is running📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- System crash/reboot events
- NFS server error messages
Network Indicators:
- None - local exploitation only
SIEM Query:
Search for kernel panic events or unexpected system reboots on NFS server systems