CVE-2025-38061
📋 TL;DR
This CVE-2025-38061 is a buffer overflow vulnerability in the Linux kernel's pktgen packet generator module. It allows local users to potentially read kernel memory beyond allocated buffers, which could lead to information disclosure or system instability. Only systems with pktgen enabled and local user access are affected.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level access, system crash, or sensitive kernel memory disclosure leading to further exploitation.
Likely Case
Local information disclosure of kernel memory contents, potentially revealing sensitive data or causing system instability/crashes.
If Mitigated
Minimal impact if proper access controls restrict local user privileges and pktgen is disabled or unused.
🎯 Exploit Status
Requires local access and knowledge of pktgen interface. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits: 128cdb617a87767c29be43e4431129942fce41df, 425e64440ad0a2f03bdaf04be0ae53dededbaa77, 5bfa81539e22af4c40ae5d43d7212253462383a6, 6b1d3e9db82d01a88de1795b879df67c2116b4f4, 8fef258b555c75a467a6b4b7e3a3cbc46d5f4102
Vendor Advisory: https://git.kernel.org/stable/c/128cdb617a87767c29be43e4431129942fce41df
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify pktgen module is updated.
🔧 Temporary Workarounds
Disable pktgen module
linuxPrevent loading of vulnerable pktgen kernel module
echo 'blacklist pktgen' >> /etc/modprobe.d/blacklist-pktgen.conf
rmmod pktgen
Restrict pktgen access
linuxLimit which users can access pktgen interface
chmod 600 /proc/net/pktgen/*
🧯 If You Can't Patch
- Disable pktgen module if not required for system functionality
- Implement strict access controls to limit local user privileges and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check if pktgen module is loaded: lsmod | grep pktgen. If loaded and kernel version is unpatched, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Check kernel version includes fix commits or verify pktgen module version. Test with controlled buffer overflow attempt.📡 Detection & Monitoring
Log Indicators:
- Kernel oops/panic messages
- Unexpected pktgen process activity
- Failed memory access attempts in kernel logs
Network Indicators:
- Unusual packet generation from pktgen interface
SIEM Query:
source="kernel" AND ("pktgen" OR "general protection fault" OR "kernel panic")🔗 References
- https://git.kernel.org/stable/c/128cdb617a87767c29be43e4431129942fce41df
- https://git.kernel.org/stable/c/425e64440ad0a2f03bdaf04be0ae53dededbaa77
- https://git.kernel.org/stable/c/5bfa81539e22af4c40ae5d43d7212253462383a6
- https://git.kernel.org/stable/c/6b1d3e9db82d01a88de1795b879df67c2116b4f4
- https://git.kernel.org/stable/c/8fef258b555c75a467a6b4b7e3a3cbc46d5f4102
- https://git.kernel.org/stable/c/a3d89f1cfe1e6d4bb164db2595511fd33db21900
- https://git.kernel.org/stable/c/c81c2ee1c3b050ed5c4e92876590cc7a259183f6
- https://git.kernel.org/stable/c/ef1158a6a650ecee72ab40851b1d52e04d3f9cb5
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
