CVE-2025-38101
📋 TL;DR
A race condition vulnerability in the Linux kernel's ring buffer subsystem could allow local attackers to corrupt kernel memory or cause denial of service. This affects Linux systems where the ring buffer functionality is used, primarily impacting systems with kernel tracing or debugging enabled. Attackers need local access to exploit this vulnerability.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory corruption leading to system crash, privilege escalation, or arbitrary code execution in kernel context.
Likely Case
System instability, kernel panic, or denial of service through memory corruption.
If Mitigated
Limited impact if proper access controls restrict local user privileges and kernel tracing features are disabled.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel internals. Race conditions can be challenging to reliably exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/0fc9a295cd8e59c3636e97395e7c74a9c89fee42
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable kernel tracing
linuxDisable ftrace and other kernel tracing features that use ring buffers
echo 0 > /sys/kernel/debug/tracing/tracing_on
echo nop > /sys/kernel/debug/tracing/current_tracer
Restrict debugfs access
linuxLimit access to debugfs which contains tracing interfaces
chmod 700 /sys/kernel/debug
mount -o remount,noexec /sys/kernel/debug
🧯 If You Can't Patch
- Restrict local user access and implement least privilege principles
- Disable kernel tracing features and restrict debugfs mount access
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with patched versions from distribution vendor. Examine if /sys/kernel/debug/tracing is accessible.Check Version:
uname -rVerify Fix Applied:
Verify kernel version matches patched version from vendor. Check that git commit containing fix is present in kernel source.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes or panics
- Unexpected kernel warnings in dmesg
Network Indicators:
- None - local exploitation only
SIEM Query:
source="kernel" AND ("Oops" OR "panic" OR "BUG") AND process="ring_buffer"