CVE-2025-39962
📋 TL;DR
This CVE-2025-39962 is an integer overflow vulnerability in the Linux kernel's rxrpc subsystem that could allow local attackers to cause denial of service or potentially execute arbitrary code. The vulnerability affects systems running vulnerable Linux kernel versions with rxrpc 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 →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 leading to kernel compromise and full system control
Likely Case
Kernel panic or system crash causing denial of service
If Mitigated
Limited impact due to local access requirement and potential kernel protections
🎯 Exploit Status
Requires local access and knowledge of kernel exploitation techniques
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/2429a197648178cd4dc930a9d87c13c547460564
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version 2. Recompile kernel if using custom build 3. Reboot system to load new kernel
🔧 Temporary Workarounds
Disable rxrpc module
linuxRemove or blacklist rxrpc kernel module if not needed
echo 'blacklist rxrpc' >> /etc/modprobe.d/blacklist.conf
rmmod rxrpc
🧯 If You Can't Patch
- Restrict local user access to prevent exploitation
- Implement kernel hardening features like SELinux/AppArmor to limit impact
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if rxrpc module is loaded: lsmod | grep rxrpcCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check git commit contains fixes📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- System crash dumps
- Unexpected rxrpc-related errors
Network Indicators:
- None - local exploit only
SIEM Query:
Search for kernel panic events or unexpected system reboots